Fix: Ndu.sys Error in Windows 10

By: Marian Cularea
6 minute read

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How can I fix Ndu.sys errors on Windows 10?

  1. Rename the Ndu.sys folder
  2. Install the latest network card drivers
  3. Roll back to a previous OS version
  4. Check for updates
  5. Use a different Internet connection
  6. Reset Windows 10
  7. Run the BSOD troubleshooter
  8. Clean install Windows 10

Have you installed the latest Windows 10 OS version to see how it goes? Well, unfortunately some users have experienced some trouble along the way with the Ndu.sys error. This is certainly one of the most common and not that straightforward errors you can get in Windows 10. Rest assured,  after following the steps listed in this tutorial, you will fix Ndu.sys errors in Windows 10 and continue your testing of the new operating system.

Fix Ndu.sys Error in Windows 10

The error “driver irql not less or equal (ndu.sys)” comes with the traditional blue screen. This means that if you get it during your usage, it won’t really go away unless you reboot your operating system and even then it might appear randomly after a few minutes. This error message is caused by incompatible hardware drivers and, to be more specific, the Wireless adapter driver.

SOLVED: Ndu.sys Blue Screen of Death error

1. Rename the Ndu.sys folder

  1. Open the “My Computer” icon by double clicking on it or by going to the Start menu and left clicking on it from there.
  2. Double click to enter the “C:/” partition or whichever partition you have installed your Windows 10 Technical Preview on.
  3. Double click on the “Windows” folder to open it.
  4. Now search for the “System32” file inside the “Windows” folder and double click it to open.
  5. Now go to the “System32” folder look for the “drivers” folder and double click on it to open.
  6. After you got to the “Drivers” folder, you will have to look for the “Ndu.sys” file.Ndu.sys folder windows 10
  7. Right click on the “Ndu.sys” file and left click or tap on the “Rename” feature from the menu that pops up.
  8. Name the “Ndu.sys” as “Ndu.sys11” or whichever name you wish but be sure to change the name and remember it.
    Note: If you cannot change the name of the file you will have to log in with your administrator account or simply change the permissions you have on this specific file to administrator.
  9. Open again the “C:” partition you have Windows 10 installed.
  10. Search in the “C:” partition for the “Windows.old” folder this time because this should be the old Windows operating system you upgraded from.
  11. Open again the “System32” folder you have in the “Windows.old” folder.
  12. Now find and double click to open the “drivers” folder.
  13. Search in the “drivers” folder for the “Ndu.sys” file.
  14. Right click on it and select the “Copy” option.
  15. Now paste it in the “drivers” folder of the Windows 10 version.
  16. Close the windows you have opened.
  17. Reboot your Windows 10 computer.
  18. Check to see if you still have the same blue screen of death with error Ndu.sys but I am sure that you will not have any more issues with it from now on.

2. Install the latest network card drivers

  1. Go to your network card manufacturer’s website.
  2. Search for the latest version of drivers compatible with the latest Windows 10 OS version.
  3. Download and install the drivers.
  4. Reboot your Windows 10 system and check if you still have the same issue.

We also recommend this third-party tool (100% safe and tested by us) to automatically download the outdated drivers on your PC.

3. Roll back to a previous OS version

If the above methods did not solve your issue, I would suggest reverting back to the previous Windows 10 OS version or Windows 10 build release if you’re an Insider.

4. Check for updates

  1. Left click or tap on the “Internet Explorer” icon you have in the lower side of the screen.
  2. Write the following into the address bar of Internet Explorer which is situated in the upper side of the window: “http://update.microsoft.com
  3. Press the “Enter” button on the keyboard.
  4. It should ask you for a system check and in that case you should left click or tap on the “Yes” button to proceed.
  5. The next window that appears will check for any available updates on your system.
  6. Follow the instructions on the screen to install the latest Windows 10 Updates.

  7. For various PC problems, we recommend this tool.

    This software will repair common computer errors, protect you from file loss, malware, hardware failure and optimize your PC for maximum performance. Fix PC issues now in 3 easy steps:

    1. Download this PC Repair Tool rated "Excellent" on TrustPilot.com.
    2. Click “Start Scan” to find Windows issues that could be causing PC problems.
    3. Click “Repair All” to fix all issues with Patended Technologies (requires upgrade).

  8. Reboot the system and check again if the Ndu.sys blue screen pops up.

5. Use a different Internet connection

  1. If you are using a wired internet connection on your Windows 10 computer, try switching it to Wireless and check if you still have the same error message.
  2. If you are using a wireless internet connection do the opposite and switch to a wired internet connection to see if you still get this error message.

6. Reset Windows 10

Another method that you can use to fix Ndu.sys errors is refreshing Windows 10. Once you’ve hit the Refresh button, the OS will remove all third party software installed on your computer. However, it will still keep all your personal files and settings.

  1. Go to Settings > Update & Security > Troubleshoot.
  2. Select Reset this PC.
  3. In the newly opened window, select ‘Keep my files’.windows 10 critical process died on boot
  4. Select which Windows version you want to refresh > hit the Reset button.
  5. Wait for the process to complete. This may take a few minutes, depending on the number of software installed on your machine.

7. Run the BSOD troubleshooter

BSOD errors are quite frequent on Windows 10. For this reason, Microsoft added a built-in BSOD troubleshooter to Windows 10’s Settings page. To run this tool, go to Settings > Update & Security > Troubleshoot > select and run the Blue Screen troubleshooter.

blue screen troubleshooter

8. Clean install Windows 10

If nothing worked, performing a clean reinstall is pretty much the last resort method. Start from scratch allows you to get rid of all the elements that triggered Ndu.sys errors and fix the issue for good.

So, if you want to clean install Windows 10, you need your installation drive or DVD and a lot of patience. The whole process usually takes one hour or two. Here are the steps to follow:

  1. Download the Media Creation tool on an alternative PC.
  2. Insert a blank DVD or a compatible USB flash drive (4GB or more).
  3. Run the Media Creation Tool.
  4. Go to Create installation media (USB flash drive, DVD, or ISO file) for another PC > hit Next.
  5. Customize your settings > select the OS version you want to install.
  6. Select USB flash drive or ISO depending on your media of choice >hit Next.
  7. Burn the files to DVD or create a bootable USB drive > Restart your PC.
  8. Press F10, F11, F12 to open the Boot menu.
  9. Choose USB flash drive or DVD-ROM as the primary boot device > hit any key to boot.
  10. Choose Advanced and format your system partition.
  11. Select it and start with the installation.

If you don’t want to go through all the steps listed above to clean install Windows 10, you can use the Windows Refresh Tool to do the job.

We hope that these solutions helped you get your network up and running until Microsoft releases a hotfix for this issue.

This is all you need to do in order to fix the Ndu.sys error message in Windows 10. Also, if you need further help with this issue, please let us know by posting a comment in the comments below.

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Editor’s Note: This post was originally published on May 2015 and has been since updated for freshness, and accuracy.

For various PC problems, we recommend this tool.

This software will repair common computer errors, protect you from file loss, malware, hardware failure and optimize your PC for maximum performance. Fix PC issues now in 3 easy steps:

  1. Download this PC Repair Tool rated "Excellent" on TrustPilot.com.
  2. Click “Start Scan” to find Windows issues that could be causing PC problems.
  3. Click “Repair All” to fix all issues with Patended Technologies (requires upgrade).

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