The laptop does not see the windows 7 network adapter. What to do if the adapter does not work

When the operating system is reinstalled, the user may encounter the problem of a missing network driver. Without this driver, neither wireless nor wired network can run. If you have a disk, there are no problems, just install the program. And in its absence, you need to find, for example, a mobile phone / tablet with a connected network in order to download the driver. To avoid such problems, when reinstalling the operating system, you must follow the correct algorithm of actions.

The driver is the link between the operating system and the internal components of the computer, that is, this program connects the OS to the motherboard, video and network cards, and office equipment. These programs are developed by the same companies that produce PC hardware and electronic office equipment that the personal computer interacts with. When buying a computer, the user does not think about various drivers, since they are already pre-installed in the system. But, for example, after the first reinstallation of the OS or the purchase of a new computer, the user will be faced with their absence.

If there is no driver for the network on the computer, there is no way to go online and download from official sites that will automatically scan the operating system and install all missing drivers. When can you run into a problem installing a network device driver? In these three cases:

1. Even on a new, just from the store, computer, the operating system may be missing, and as a result, the driver.
2. When the operating system is installed/reinstalled.
3. When a system failure occurs and the driver stops working.

The first case is the easiest. In the box with the purchase should be discs with drivers. The network device driver is located on the software disk for the motherboard.

Since lately users are increasingly building computers themselves (selecting internal components), the DVD drive may not be available, and as a result it is not possible to install any driver from the disk.

In this regard, we can advise you to keep the full set of drivers in a separate folder on your PC or download them to a flash card. In this case, you do not have to look for a mobile device to go to the official pages of manufacturers' websites and from there download a program that will automatically install the missing drivers.

Installing the network driver

Before installing the driver, you must identify your computer. All brands and models of internal computer hardware are encoded with special "ciphers". This is done so that during installation the driver can identify the computer model and its manufacturer. The network device driver code looks like this: PCI/TECH_xxxx&DEV_xxxx&SUBSYS_xxxxxx. TECH means that the hardware for the computer was made by A4Tech, and DEV is the device ID.

Step 1. Hardware identification

In order to find out the code, click Start, enter device manager in the search field. Next, a menu will open with which you can identify the equipment. Press " Network adapters» and select the name of the controller.

Once you do this, the Details section will open. Find their "Properties" and select "Model ID". The first line contains complete information about the device model.

Step 2: Install/Update Network Adapter Driver

This will be the identifier of your equipment. Now you need to find it on the Internet by entering the name in any search engine, for example.
The search engine will give the official driver page, and you need to download it to your PC. Then comes the installation process itself. If you need to update a network device driver, you do exactly the same thing: find the ID, enter it in the search, download and install.

To install a missing or latest version of the driver, use the "Device Manager". Do the same for the last step Update drivers».

Select "Search for driver software on this computer".

Go to the folder where you saved the necessary drivers downloaded on the official website of the manufacturer, and install them using the "Next" button.

Many users, before installing new versions of drivers, remove the old ones in order to avoid conflict and inoperability, because even if you did everything correctly, the Internet may not appear on the computer. In this case, you still need to take the advice of users and remove the old versions.

How to do it! In the Device Manager, you can remove the old version of the network driver. Agree with the choice, and the system will remove the network device driver that was previously installed on your computer.

There are two steps left and your computer will work fully. Step one - reboot and open Device Manager. In place of the removed driver will appear " network controller" In chapter " Other devices».

At the final stage, follow the steps from (updating/installing network device drivers).

The network adapter for a computer / laptop is responsible for accessing the Internet, which in modern devices is connected via a USB or BNC connector. Since it is built-in, and the ability to explore the World Wide Web is in most cases set up by the wizards, the question of what it is and how to make it work arises if breakdowns occur. It's not easy to figure this out, but it's possible.

What is a network adapter

An additional connecting element between a PC or laptop and other devices that provide access to the Internet is called a network adapter (the terminology of the Intel processor manufacturer). In most modern computers, it is built into the motherboard. There are other names for the device. What is a network card, card, or Ethernet adapter? These are all variants of the names of one device.

What function does

In the OSI system model, the network adapter is responsible for the functioning of the second, link layer. In conjunction with the driver, it also makes the physical hardware work. The task of distributing responsibilities between them, each manufacturer decides for himself. In addition, the OS (operating system) module is responsible for the link layer. Together they perform two main operations: sending and receiving data from the network to the PC and vice versa, and also take part in:

• monitoring of incoming/outgoing traffic;
• remote configuration change;
• improve performance and prioritize the network;
• remote activation from a central workstation;
• encoding/decoding of sent/received data;
• packet formation (transmission/reception mode).

Classification

Although most modern PCs have built-in network cards, they can break and require replacement. To do this, it is not necessary to completely disassemble the computer, since there are two large groups of these devices:

1. External. Some are connected via the motherboard's PCI connector, others use the ISA bus.
2. Embedded. They are also called integrated. The output is presented as a connector on the panel next to the USB ports. Nearby there are indicators - LEDs, which are guided by the performance of the device. Plus built-in device: convenience. Minus: unreliability.

3Com approached classification from a different angle. In it, all adapters are divided into generations. Varieties include:

1. First generation adapters. They were built on discrete logic microcircuits. They had low performance - even if the computer memory was large, the adapter buffer could only hold one frame. They had many types, each of which needed its own driver. In addition, OS modules have not been standardized. As a result, configuring the network card was difficult. Used devices on old computers.
2. Second generation adapters. ASIC chips are used, the size of the buffer memory allows for multi-frame transmission in parallel mode. The reliability of 2nd generation adapters has been improved, standard specifications for drivers and interfaces have been developed. In addition, the transmission speed has increased.
3. Third generation. These are the latest devices that 3com lists its EtherLink III cards as. Frame processing is pipelined. The adapter is configured automatically. It connects to the network via a BNC connector (for cable type - twisted pair).
4. Fourth generation. High speed boards that support Fast Ethernet standards.
5. Fifth generation. Gigabit Ethernet supporting modern network protocols.
6. Sixth generation. 400 Gigabit Ethernet, which is currently in development. It will start to be applied no earlier than 2020 for home PCs. Sixth-generation Ethernet adapters for servers have already appeared (they are used by providers).

There are other parameters by which devices are classified. The main ones are listed below:

• by data transmission medium (wired, wireless);
• by functions performed (implementing the first two OSI levels / the first four);
• by topology (similar to local networks: bus, ring, star, tree, combined);
• by belonging to the type of PC (client, server);
• by bus type (ISA, EISA, PCI, MCA).

Species

Although in order for the selection and configuration of the device to be correct, it is desirable to know some of the subtleties and features of the adapters, it is not necessary to have all the knowledge of a system administrator. The main types of boards you need to know:

• wired;
• wireless;
• virtual.

They differ in case size and external parameters, they can be connected directly to the motherboard or via a USB socket. Otherwise, they look similar, representing a cable with the appropriate key for connecting to a computer port. Provide wired network data transmission, connect PC/laptop and router. Sometimes they are sold bundled with software (drivers) for various operating systems, but most modern operating systems find and install it automatically.

Wireless

Often, a network adapter refers to the wireless type of device. It is small, mobile and versatile, it is also called a modem (although they are designed for 3G), but within this variety, the concepts are interchangeable. To work with wireless networks - that's what the network card is for in this case. It looks like a flash drive, connects to a USB port, configures itself and searches for available Wi-Fi points. A handy thing if the integrated peripheral is broken.

Virtual

Designed to create private and secure networks (VPNs). They work with the help of special programs, are built on the basis of physical adapters. The installation depends on the type of virtual card and the selected software. For example, in the Windows operating system there is a special section "Control Panel" for configuring the adapter. Another feature of this type of board is the possibility of remote configuration.

The two most important points regarding connectivity are what type of connector is used by the network adapter and what drivers are needed to make it work. There can be several answers to the first question: USB slot, PCI port, or ISA bus. The last two options involve connecting directly to the motherboard. Drivers in most cases are detected automatically or come with the adapter. If not, you need to search for them on the Internet by device model. Full instructions for connecting a wired network card:

1. Buy a device in one of the stores in Moscow, St. Petersburg or any other city in the Russian Federation.
2. Unpack, read the instructions, use it to determine the type of connector.
3. Connect the plug to the desired port on the router and computer.
4. (option a) See automatic installation, wait for it to finish.
   (option b) If there is a disk with drivers, insert and run the program.
   (option c) Find the required software on the Internet (use proven services!), download and run.
5. Go to Control Panel - Device Manager - Network adapters. The list should display the name of the board. If there is no exclamation mark next to it, everything is installed correctly.

Connecting a wireless device is carried out in a similar way, but in this case only a PC and a USB connector are used. Drivers are installed automatically. After this operation, the computer immediately starts searching for available Wi-Fi networks. There may be conflicts with the OS, so that they do not arise, you need to select a device with the correct parameters (will be discussed below).

If there is no network adapter in the device manager, it means that something went wrong during the connection. But what exactly? The main reasons and ways to solve them:

1. Board failure. Unlikely cause unless there was physical damage. If there were, you need to carry it in for repair or replace the adapter yourself.
2. Errors in the operating system. Solution: roll back to a previous restore point. If not, reinstall the system.
3. Problems with drivers. They are solved either similarly to the previous paragraph, or updated manually. You need to download the software from the official website, since dubious services are the main reason why the network card for the computer does not support the driver.
4. The intervention of the built-in anti-virus protection of Microsoft Windows or otherwise. Start the system in safe mode, disable your antivirus and check the operation of the hardware.

What to do if the adapter does not work

Make sure that the computer sees the device, if not, use the instructions above. Check the system for viruses with built-in OS protection. If the problem persists, check out the following solutions:

1. Diagnose the card through the Device Manager. To do this, call the context menu and find the corresponding item.
2. Remove all adapters from the Device Manager list. Restart your computer/laptop.
3. As Administrator, open a command prompt. Scan the system: type sfc /scannow and Enter.
4. Update or roll back your drivers.
5. Check the board's operation indicators. If they do not light up or do not blink, it is time to contact the service center.

Network adapter price

The higher the generation and capabilities, the higher the cost of the device. But there is no reason to chase the highest price, since the question is not what technology the adapter supports, but what the computer's processor can work with. Characteristics can be viewed on the packaging, check with the seller, or read on the screen by going to the official website of the manufacturer. The difference in prices for Moscow and the region is in the table below:

Connection method. You need to first check if you have a suitable free connector on your computer.

network standard. Although, for example, 802.11ac provides speeds higher than 802.11n (up to 10 Gb / s), it makes no sense to overpay if the provider provides only 100 Mb / s.

Power. Optimal - 20 dBM, receives signals even from weak sources.

Video

Windows 7 supports the vast majority of network cards. Moreover, most modern network equipment is sharpened specifically for Windows, with all the ensuing problems, because Windows is not famous for its stability. However, Microsoft promptly solves most of the problems that arise with network equipment, honor and praise to them, but those that inevitably arise will be analyzed in detail in this article.

First of all: in order to expand the potential range of tasks that a client computer performs on a network, there is a need to change the basic parameters of a network card.

Here are examples of such tasks:

How to see a list of available network adapters (network connections) in Windows 7?

The list of available devices on Windows 7 can be seen in two ways:

The second method starts by opening the "Device Manager" using the "Run" window:

Enabling the network card, including using the BIOS

Read the instructions for all BIOS versions in the article -

On laptops, turning the network interface on and off is done by pressing a keyboard shortcut, on desktop computers, through the BIOS menu.

To enable the wireless network adapter on laptops, there is a Fn + F12 combination, although some manufacturers make a special key for this function.

Installing a network driver on Windows 7, including without the Internet

Since the network adapter is equivalent to the Internet, its absence makes it very difficult to download the driver for the network card. The issue is resolved by pre-recording drivers on media.

1. Drivers are downloaded and written to a flash drive, CD, etc.
2. The media is connected to the PC.
3. After that, the "Device Manager" opens, using the "Run" window (called by pressing the "Win + R" keys), in which the "devmgmt.msc" command is entered.

   

4. There is a section "Sound, game and video devices", subsection "Unknown device", which is not yet installed. You need to start installing drivers for an unknown device (future network adapter) after selecting it with the right mouse button and selecting it in the "Properties" drop-down menu.

   

5. Click the left mouse button - "Update".

   

6. Manual setting is selected.

   

7. The path to the driver media is written or indicated.

   

8. Finally, the installation begins. It takes no more than a couple of minutes.

The network card without drivers in the "Device Manager" was in the "Unknown Devices" section. After the update, it takes its rightful place - in the "Network Adapters".

Video - How to install a network adapter driver without access to the Internet

Setting up a network connection in Windows 7

Although Internet Service Providers prefer to configure their customers' network equipment themselves, sometimes more advanced configuration is required. This is typical for computers with multiple adapters.

For this:

1. Go to the context menu "Start", open the "Control Panel".

   

2. In the "View" category, set the value to "Category", find and open the "Network and Internet" section.

   

3. Click on the "Network and Sharing Center" link.

   

4. Click on the "Change adapter settings" link.

   

5. Right-click on the network connection shortcut, select "Properties".

   

6. Check the box "Internet Protocol Version 4 (TCP/IPv4)", click on the "Properties" button.

   

7. Check the box "Use the following IP address", fill in the fields with data.

   

   On a note! The fields and "Main gateway" are in the agreement with the Internet provider, the remaining fields contain the same values ​​for all users.

Video - The computer does not see the network adapter

How to view and change network card settings (IP, Mac, and more) in Windows 7?

It is easy to see the adapter parameters and its MAC address thanks to system programs.

For this:

How to reset all network driver settings?

If you want to completely roll back all settings to their original level, then do the following:

Is it possible to create two network cards?

Many users are thinking about getting a second network card. Physically, there are no problems here: most laptops and computers support a second network card. But there are exceptions, as well as damaged slots, as well as netbooks and tablet computers. In this situation, you need to use a virtual board that distributes Internet traffic no worse than a physical one.

The ability to install such a virtual card is in the Windows system itself:

1. In the "Start" menu, type "manager" in the field, open "Device Manager".

   

2. In the "Device Manager" click on the "Network adapters" section, select "Actions" in the top menu, and from the drop-down menu - "Install an old device".

   

3. The installation wizard will open. You need to select the manual option to access the list of drivers for all devices.

   

4. Scroll through the categories, select "Network adapters", click "Next".

   

5. Then click on the "Micrsoft" item, add "Micrsoft loopback adapter" or "Microsoft Loopback Adapter", which will then appear in the network connections window.

   

   

6. Confirm. The network adapter should now appear in Network Connections.

   

   

Complete reset of network drivers

If your Internet is down or most of the Internet pages are not opening, then resetting all parameters and the TCP / IP stack can be an excellent solution to this problem.

Disable network card

To disable the network adapter, the best remedy is to use the most standard and convenient Windows tool for maintaining all such equipment - this is the device manager. Do the following:

In this case, the shutdown will occur immediately, it will not even be necessary to reboot the OS.

Important! After the adapter is disconnected, the Internet connection will be cut off along with it and there will be a disconnection from the local network. Therefore, it is recommended to finish all your business on the Internet in a timely manner before turning off the network card.

The network adapter does not have valid IP settings

A common problem for Windows 7 users is when there are problems accessing the Internet and the Network Diagnostics tool gives a message that the network adapter does not have valid IP settings.

AT this case you can try resetting your router first. If you have a wired connection, then disable and then re-enable your network-connection in the network connections menu. If this does not help, then you can proceed to the next steps.

Step 1. Renew your IP address - this is the easiest method, although not always helpful in this case. To do this, open Command Prompt (as administrator) and enter the following commands:

Check again if the error is still displayed? If yes, then let's move on.

Step 2 You can try to reset the network settings, namely the IP protocols. The TCP/IP protocol stack is recommended to be reset to factory settings in the most acute cases, when problems occur as a result of malware, etc. To do this, open a command prompt in administrator mode and type:

Network card settings crash

When setting up a network, users may encounter the following situation: when the IP address, gateway, DNS are manually entered - the prescribed parameters are not saved, but reset to factory settings, and thus it becomes impossible to change network settings from automatically receiving addresses from the router. One of the common reasons for this is the incorrect removal of an antivirus that has firewall functions.

What should be done:

1. Reset the TCP/IP protocol stack to factory settings (see how to do this earlier in the article).
2. Reboot.

If this does not help, then do the following:

After that, the problem should be resolved.

What to do if there are problems with the network card?

Many plug-in network adapters, due to their vulnerability to electricity, can fail for a while during periods of severe thunderstorms, or power outages in a building. In most cases, difficulties manifest themselves in situations with wired equipment, since multi-storey buildings have long cable routes laid by Internet providers in places not quite intended for this, next to telephone and television cables and high voltage wires. High humidity, dampness and low temperature in this area - all this has an extremely negative effect on the insulation of wires, so breakdowns appear in them. .

Sometimes also, in more rare cases, breakdowns occur due to emergencies such as a major thunderstorm. Network adapters often burn out, or users begin to experience difficulty logging into the network. In this case, the equipment will function, but there may be no connection to the Internet during such periods.

Unfortunately, this problem can only be solved by purchasing another network adapter model. For a desktop computer, it complies with the PCI standard, for a laptop - USB and PCMCIA.

It is also not recommended to include a network cable in the router, and then connect a computer to it, because even if the router breaks down, its replacement will be relatively inexpensive compared to replacing the network card built into the computer (or even the entire motherboard).

Windows 7 does not see network adapter

When the integrated network equipment is not shown in either the Network Connections window or the Device Manager, and is not even reflected in the Unknown Devices section (which would be due to the lack of drivers), then something is most likely wrong with it physically. It is quite possible that some transistors burned out on the network card board, or a chip flew off - in this case it is more expedient to buy a new card.

Video - How to set up a wired network card on Windows 7

Question: The laptop does not see the network adapter

Notebook DNS-0169860, Windows 8. After the reboot, I stopped seeing the network LAN adapter, and Wi-Fi works fine. Before that reboot, I did not install anything, only watched videos on YouTube. Reinstalling the driver doesn't help. Neither the old nor the new version. In the LAN device manager, the adapter is not shown, and the drivers during installation give an error that the device was not found. Can you tell me what's the matter?

Added after 1 hour 21 minutes
UPD: When you turn on the display of hidden devices, the adapter was displayed in the manager, however, it says "Now this device is not connected to the computer. (Code 45)".

Answer: Throw off the settings in the bios setup, if it doesn’t help, then apparently there is a problem with the hardware, it should also be visible in the boot menu if it is alive.

Question: Does not see the network adapter

Guys, hello!!!
I do not know what to do! Today, after restarting Windows, a red cross appeared on the connection network! I thought the cable might have come off, but everything is in order with the cable, I checked it - it works! I go further, I go into the device manager, in the network adapter tab, the exclamation mark avast! Firewal (I don’t remember what else), I deleted it without understanding what it was, went further, rebooted Windows, looked at the BIOS, didn’t reveal anything, there was still no connection! Then I removed the network adapter from the manager, rebooted the system, updated the devices in the task manager, nothing appeared in the network adapter, this tab is simply gone!!! Moreover, behind the system unit, the LED blinked green before, as I understand it, when it was working, now everything is muffled, nothing is on! Tried installing drivers from the motherboard. Nothing! Zero point! I roughly understand that you need to install firewood, but I can’t imagine where to find them ????
System 7 64-bit!
Guys, I'm begging you, help!! My brain is already exploding!!

Answer:

Message from kilbuz

where to find them?

On the motherboard manufacturer's website

Question: I fell asleep and cannot wake up the network adapter

Introduction (maybe not related to the problem, but you never know)
To begin with, there were problems in the system with the Visual C ++ libraries that I seemed to have solved, but after that, during the game, a visual artifact flew out to full screen and everything hung, the system did not respond, there were blue stripes on the whole screen. I rebooted, after which the system stopped loading (black screen after loading Windows). I tried to rearrange the video card driver, but it did not work out. In the end, I decided to rearrange Windows because it was already boiling, problems began to appear more and more often.

The essence of the problem.
I put a new clean system windows 7 maximum x64. I copied all the necessary data from the Windows old folder and safely erased it. Then I tried to install the network driver in order to gain access to the network and install all the other drivers. The driver didn't install. Instead, he gave me this: "the realtek network controller was not found if deep sleep mode is enabled please plug the cable"
Got into the Internet to solve the problem, but nothing helped from what I found.
What have you been doing:

• tried other drivers and driver analysis programs (the latter didn't see the network adapter at all)
• set the standard settings in the BIOS, enabled and disabled the realtek network output (and it is in the BIOS)
• disconnected the computer from the network and took out the RAM for the whole night so that the motherboard completely turned off

The device never woke up. I don’t know what to do, how to wake him up, I have no idea, and I’m already completely desperate. I ask for help, can someone come across such a problem?
motherboard asus m5a99x evo r2.0 realtek

Now I took out the RAM again and left it for the whole day, because they write that different motherboards need different times to turn off

Answer:

Message from kloskon

I just don't understand why this adapter is visible in the bios

Because it's in the bios. My motherboard has an LPT port in the BIOS, but it doesn't exist on the motherboard at all.

Question: Windows 7 does not see the network adapter!

Hello everyone, can someone help me with this problem:
Today I installed windows 7 (licensed) from the disk, it was windows 10 (just a month has passed). The installation went without problems, but my computer is not connected to the Internet. I went to "network and sharing center" -> "change adapter settings" and it's empty!! I decided to go to the device manager, but there is no "Network adapters" tab. I don't understand what's wrong. Before that everything was fine.

Motherboard: Gigabyte Z77P-D3

Answer:

Message from MrTwangy

Everything worked!

Who would doubt that
good luck

Question: Windows 7. Lost network adapter

The problem is this

Answer: Sharik,

Uninstall the network adapter in device manager. Then scan in the same place for new devices. Should help, if it doesn't help download drivers.

Question: Windows 7 - missing network adapter

I apologize right away if there is such a topic or a similar one, it’s not convenient to scroll through from the phone, it always wikis ...
The problem is this
Yesterday I reinstalled Windows from 7 to 7, now the acer laptop does not find the network adapter, but it sees the bluetooth, tried to turn it on in the BIOS and turned it off did not work. What to do if the adapter is dead?

Answer: I saw the network adapter in the device manager after I shook the connector a little

Question: The computer does not see the Wireless adapter

The other day I assembled a computer, turned it on and installed Windows 8.1 through BIOS. But there is no Internet, such a cross, what should I do?
I enabled Lan in the bios, in the task manager there is a network adapter, but there is no wireless. The driver downloaded everything, for the motherboard, video card, network adapter, but nothing helps. Watched all the video. How to make the computer see the wireless adapter?
Network adapter: Realtek RTL8168-8111 Family PCI-E Gigabit

Screen 1-
Screen 2-

Answer: Well, I did not find on the docks that there is a Wi-Fi adapter on board. The description says about support for MSI M-Cloud technology, which allows you to do something like your home cloud - but this is just a software solution. To implement it, the docks directly say that you need to have the wireless network module installed:

You must have an active network connection and an installed Wi-Fi module to
enable SoftAP.

So, alas, you need to purchase a wireless card separately.

PS: And install the rest of the uninstalled devices.

Question: Failure of network adapter drivers, freezes and crashes from games

At first I thought that the viruses ... Cleaned all the viruses. And again, these freezes in games and crashes ... and yesterday, after turning on the system unit, the network adapter drivers fell off. I had to do a system rollback ... This morning when I turned it on. the same thing ... Blade driver network adapter.
motherboard MSI ZH77A G41. Sometimes there is a reboot of the system ... in the last few days, the PC has rebooted 3 times. And somewhere about a week ago ... when I turned on the PC, I was immediately thrown into the BIOS. In games, freezes, dark screen and crash. I suspect that something is wrong with the motherboard ... What do you think?

Added after 39 minutes
Network drivers fall off every time I restart my PC...

Answer: accidentally went to a phishing site ... in the search engine they made the same logo with the off site. Well, I did not read the description of the link and clicked on the picture. The antivirus was disabled ... well, seeing that the site was not the same. He immediately left ... well, he did not attach any importance to this. A few hours later, when watching a video ... I notice that the video card is loaded at 100%. Well, I rebooted the PC ... downloaded other web chickens it. it found 2 malicious files and deleted them. After I noticed freezes in games with crashes. And again, Prof. began to load 100% in idle time after leaving the games ... I had to reboot. In GTA5 online, the video card drivers generally crashed and were restored ... After I tested the video card in the furmark ... 68 fps above 80c the temperature did not rise. After that, I was advised to download Malwarebytes Anti-Malware... well, I scanned the system with it and viruses got out there again. Well, I deleted them as I was advised on a special site. but each time there were new viruses... After Kaspersky scanned the system and it cured... Some files were sent to quarantine... some deleted. Well, the crashes from the games did not stop ... and the system reboots and the failure of the network drivers also began. In any games and on any settings, the loading of the video card jumps like a sewing machine. The asus r9 290x dc2 video card has never warmed up above 80c. I tested it on another system ... everything is fine. And yet ... about a week ago or a little more ... suddenly, when I turned on the PC, I was immediately thrown into the BIOS ... I did not reinstall the system after the viruses.

Question: Drivers for the network adapter do not work

One fine day (today) I noticed that the Internet was not working. In the parameters of this modem, there is no, and generally kaput.
I decided to reinstall the driver on the network adapter, but the problem was not solved. The computer advises you to install them from the Support Center, but it does not work without the Internet. This driver is needed for the M5A78L-M motherboard from Asus, called Qualcomm Atheros AR8171/8175 PCI-E Gigabit Ethernet Controller (NDIS 6.20) #2. I install from the disk that was in the box when I bought it. Before that, I sat at the computer for 3 days after reinstalling Windows normally.
What to do, tell me?
Connecting via an Ethernet cable, which is connected from a modem (whose model, unfortunately, I can’t say now), to the TP-Link TL-WR740N Wi-Fi router, I also can’t enter the menu in the browser.
In ipconfige, except for the IP protocol settings for Windows, there is nothing at all.

Answer: try to remove the adapter from the device manager, along with all the drivers and install it again

Question: The computer does not see the network server

The computer, after several frauds in search of errors in the dns, does not see the network server. Urgently

Answer: Does that mean reboot your computer?

Added after 9 minutes
Microsoft Windows
(c) 2009 Microsoft Corp. All rights reserved.

C:\Users\Ruslan>ping ya.ru

Packet exchange with ya.ru with 32 bytes of data:
Response from 213.180.204.3: bytes=32 time=5ms TTL=55

Response from 213.180.204.3: number of bytes=32 time=4ms TTL=55
Response from 213.180.204.3: number of bytes=32 time=4ms TTL=55

Ping stats for 213.180.204.3:
Packets: Sent = 4, Received = 4, Lost = 0
(0% loss)
Approximate round-trip time in ms:
Minimum = 4ms, Maximum = 5ms, Average = 4ms

C:\Users\Ruslan>nslookup ya.ru
╤höthyo: UnKnown
Address: 192.168.1.1

╚ь*: ya.ru
Addresses: 2a02:6b8::3
213.180.193.3
213.180.204.3
93.158.134.3

C:\Users\Ruslan>nslookup ya.ru 8.8.8.8
╤хЁтхЁ: google-public-dns-a.google.com
Address: 8.8.8.8

Untrustworthy answer:
╚ь*: ya.ru
Addresses: 2a02:6b8::3
213.180.193.3
93.158.134.3
213.180.204.3
It's all?
By the way, the network server is not in the sense of "network server", but the home server, which should be visible in the explorer, but no.
And in the assistant everything is ok

Even yesterday everything was fine, you enjoyed high-speed Internet, and today you turn it on in the morning, and the computer does not see the network card. However, think about it here. The first thing that comes to mind is that it is out of order, you need to urgently run to the technomarket for a new spare part.

That's why it's a good idea to always buy two absolutely identical system units at once. In order to be able to troubleshoot in case of problems by replacing suspicious modules with known good ones.

This is the path for advanced users and computer geeks. A mere mortal user often cannot afford such excesses. In this case, one should remember the folk wisdom: “The strong and courageous goes quickly and easily, but the weak and timid - long and hard.”

Decryption - if there is nothing to check the equipment, you will have to check all the problem areas consistently and methodically.

The computer does not see the network card - the main reasons

1. The board itself is defective.
2. Operating system malfunctions.
3. Corrupted network drivers.
4. Changed network connection settings.
5. Antivirus or Windows Firewall interference.

In fact, Chinese electronics do not deteriorate as often as Chinese shoes. Therefore, if you did not drop the system unit on the floor, did not climb inside and did not switch anything there, the probability of failure of the network card itself is extremely small. Most likely the settings have changed.

Go to Control PanelAll Control Panel ItemsNetwork and Sharing Center and change the settings

But the Windows operating system is not only smart and quick-witted, but also a rather fragile organization. A sudden power outage can easily cause serious damage to system files and connection settings.

Recovery options

1. Roll back Windows to an earlier restore point. It is quite possible that after carrying out such an operation and rebooting the computer, everything will work for you. And not only the network card will appear, but something else good will restore its performance. Sometimes recovery needs to be done several times. Anyway - it's better and safer than starting to rearrange the blocks and buses in the system unit. What’s more, you don’t need to buy anything yet.
2. A more radical remedy is a complete rearrangement of the Windows operating system. This path may turn out to be the most rational, provided that your system has been standing for quite some time and recently you have begun to notice a general deterioration in the performance of your computer. Regular cleanings do not give tangible improvements? It's time to update Windows. New RAMs, Seven and Eight are reinstalled within half an hour, so there are no problems.

Why is it useful to reinstall Windows? Because the distribution kit includes all the drivers necessary for work. When installing the system in automatic mode, all the necessary settings are made for all devices, and the user does not need to do anything except press the Enter button from time to time. Updating drivers separately is not an easy task. More suitable for advanced users.

In addition, to reinstall the drivers you will need an Internet connection, which is just not there. If there are backup Internet connections, you are sure that you are able to find exactly the driver for the network card that you need - then try this path.

You can download a whole package of drivers from the manufacturer's official website and then let the computer determine the most suitable option automatically using the Driver Installation Wizard.

If the problem really was with the driver, after the update, the computer should return to normal.

The network card was not found by the computer and is not installed as a device

When you connect some new element to the computer, the operating system detects the connection and then tries to configure it on its own as expected. Sometimes automatic connection does not occur and then you need to manually install and configure.

Go to the Control Panel and select the menu item Install New Hardware. The New Hardware Connection Wizard interface will open. There are two options to choose from:

1. The device is already connected to the computer.
2. The device is not connected yet.

Try the “connected” option and look for your lost device in the list that opens. If it's not on the list, it means the computer hasn't found it yet. Then click “not yet connected” and reboot the system. You can do this - turn off the computer, then open the system unit, disconnect and reattach the network card, perhaps the contact has deteriorated.

After starting the system, repeat the procedures with the Found New Hardware Wizard. If the device appears in the list of connected devices, continue the configuration through all the steps of the Wizard.

Incompatible driver update

Sometimes a failed Windows update can be the cause of a card not working. Or, in the process of downloading automatic updates, there were disruptions in the Internet connection, some of the files were downloaded with violations. Then you need to reinstall the old driver.

If you have a distribution of OS Windows, it is best to take the file directly from the disk. Did everything work before? Or search for the previous version of the driver on the Internet.

viral infection

Sometimes a virus infection becomes the reason for the disappearance of a network card from sight. Scan your computer with an antivirus. Try to cure the system using Dr. Web CureIt. If it's a virus, everything will be fine.