How to fix it: rtwlanu.sys – BSOD error

You are here because you are struggling with a BSOD related to the rtwlanu.sys file. This error seems to mostly affect Windows 10; however, there are times when PCs running Windows 7 or Windows 8 experience the same error. Most people report that rtwlanu.sys BSOD errors are random and can occur when using Wi-Fi heavily, such as when streaming on YouTube or downloading a file. In today’s post, you will learn how to fix “rtwlanu.sys is missing or corrupt” in Windows 10.

SYS files like rtwlanu.sys are classified as Win64 EXE (driver) files. As a Realtek WLAN USB NDIS Driver 29489 file, it was created by 3DP for use in Realtek WLAN wireless USB 2.0 adapters. Rtwlanu.sys was first released on 2012-01-08 for Windows 8. Version 1026.12.0606.2014 was released on 03/12/2018 for 3DP Net 18.12. Rtwlanu.sys is included in 3DP Net 18.12, Windows 10, and Windows 8.1.

This article describes all the file details, troubleshooting instructions in the SYS file for rtwlanu.sys problems.

What causes BSODs caused by rtwlanu.sys?

What causes BSODs caused by rtwlanu.sys?

We investigated this particular question by reviewing various user reports and analyzing various repair strategies that other users have successfully implemented in a similar scenario to prevent BSODs from occurring.

It turns out that several causes can cause this behavior. Below is a list of potential culprits that may be responsible for this critical BSOD crash:

Corrupted WLAN driver – One of the most common scenarios that lead to this type of DSOB is a corrupted network driver. Realtek drivers are often cited as the cause of this behavior in Windows 10. If this scenario applies, you may be able to resolve the problem by removing the corrupted network driver using Device Manager and replacing it with a dedicated or generic Windows driver.

WLAN driver may not wake up your computer – If you get a BSOD when you try to configure/wake up your computer from hibernation or hibernation mode, chances are that this behavior will occur because the WLAN is not configured to wake up your computer. This behavior can be corrected by accessing the power management settings and allowing the device to wake the computer.

Damaged system files – Damaged system files can also be the cause of this failure. In this case, the problem can be resolved either by using a system restore point or by updating all Windows components with a new installation or restore.

If you are currently having trouble fixing this error message, this article provides you with several possible fixing strategies. Below are a number of troubleshooting strategies that other users have successfully used in a similar scenario to solve the problem. Each of the possible solutions below has been validated as effective by at least one interested user.

To be most effective, we recommend that you follow the methods listed below in the same order in which we ranked them (by difficulty and effectiveness). Finally, you should come up with a solution that should solve the BSOD (or at least help you determine the cause), regardless of who caused the problem.

How do you fix BSOD Rtwlanu.sys in Windows 10?

How do you fix BSOD Rtwlanu.sys in Windows 10?

Reinstall the corrupted network driver

As we mentioned before, rtwlanu.sys BSOD error can occur if your network driver is corrupt. So you can try to reinstall the corrupt network driver to fix the error.
To do this, proceed as follows:

  1. Press the Win + R keys simultaneously to open the race box. Then type devmgmt.msc and press Enter to open the Device Manager.
  2. Expand Network Adapters, then right-click the wireless network driver you are currently using and select Uninstall Device.
  3. Click OK to confirm the changes, then restart your computer. The next time your computer restarts, Windows should have reinstalled the wireless driver and the BSOD error should be resolved.
Changing your LAN settings

You can also try changing your local network settings to get rid of the BSOD error caused by rtwlanu.sys. To do this, you will need to do the following:

  1. Open Device Manager, expand Network Adapters, then right-click the WLAN driver you are currently using and select Properties.
  2. A new window will open, click the Power Management tab and select the Allow this device to wake up your computer checkbox. Click OK to save your changes.
  3. Restart your computer to see if the error has been corrected.
Perform a system restore

If you haven’t resolved the problem after trying the above two methods, and you’ve created a restore point beforehand, you can try performing a system restore to resolve the problem.
System Restore allows you to restore your computer to its previous normal state.

Here’s a simple guide:

  1. Open the Run window, type rstrui and press Enter to open the System Restore window.
  2. In the window that opens, click Next. Then select a system restore point from the list and click Next.
  3. Confirm the restore point and click Finish. Read the message “Once started, system restore cannot be interrupted. You want to continue” and then click Yes.
  4. Reboot your computer and make sure that the error is resolved.

Note: If you have not created a system restore and the BSOD caused by rtwlanu.sys is still happening, you need to perform a clean Windows installation.

Frequently Asked Questions

Uninstall the currently installed device drivers, then install the latest version of the device drivers. Install all important Windows updates. If overclocking (i.e. loading components beyond their design limits), return to default settings, at least until the problem is resolved.

  1. Swap what you did.
  2. Update your BIOS.
  3. Check your computer for viruses.
  4. Check if you have enough memory.
  5. Apply Windows service packs and other available updates.
  6. Update your hardware drivers.
  7. Check your system memory and hard drive.
  8. Restore your system.

The "DRIVER_IRQL_NOT_LESS_OR_EQUAL" error would occur if your network driver was using the wrong memory address. You may also see "ndis. sys" on the screen. You can update your network driver to fix the error.

The SYSTEM_THREAD_EXCEPTION_NOT_HANDLED error occurs when the system thread generates an exception, which the error handler cannot handle. Since this error went unnoticed, the computer-generated warning signals and decided to shut down to prevent further damage.

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Mark Ginter is a tech blogger with a passion for all things gadgets and gizmos. A self-proclaimed "geek", Mark has been blogging about technology for over 15 years. His blog,, covers a wide range of topics including new product releases, industry news, and tips and tricks for getting the most out of your devices. If you're looking for someone who can keep you up-to-date with all the latest tech news and developments, then be sure to follow him over at Microsoft.