- 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.
- First, try to rename the Ndu.sys folder and if that doesn't work, install the latest network card, drivers. If you struggle with those, find all the instructions in our guide below.
- BSoD errors are not so troublesome if you are prepared. Don't worry, you don't have to learn all that. Just go to our BSoD troubleshooting section and read our expert articles.
- If you run into other Windows 10 errors, we prepared a Windows 10 errors Hub filled with solutions for you
How can I fix Ndu.sys errors on Windows 10?
- Rename the Ndu.sys folder
- Install the latest network card drivers
- Roll back to a previous OS version
- Check for updates
- Use a different Internet connection
- Reset Windows 10
- Run the BSOD troubleshooter
- 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.
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.
How can I solve Ndu.sys Blue Screen of Death error?
1. Rename the Ndu.sys folder
- Open the My Computer icon by double-clicking on it or by going to the Start menu and left-clicking on it from there.
- Double click to enter the C:/ partition or whichever partition you have installed your Windows 10 Technical Preview on.
- Double click on the Windows folder to open it.
- Now search for the System32 file inside the Windows folder and double click it to open.
- Now go to the System32 folder look for the drivers folder and double click on it to open.
- After you got to the Drivers folder, you will have to look for the Ndu.sys file.
- Right click on the Ndu.sys file and left click or tap on the Rename feature from the menu that pops up.
- 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.
- Open again the C: partition you have Windows 10 installed.
- Search in the C: partition for the Windows.old folder this time because this should be the old Windows operating system you upgraded from.
- Open again the System32 folder you have in the Windows.old folder.
- Now find and double click to open the drivers folder.
- Search in the drivers folder for the Ndu.sys file.
- Right-click on it and select the Copy option.
- Now paste it in the drivers folder of the Windows 10 version.
- Close the windows you have opened.
- Reboot your Windows 10 computer.
- 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
- Go to your network card manufacturer’s website.
- Search for the latest version of drivers compatible with the latest Windows 10 OS version.
- Download and install the drivers.
- 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. Rollback 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
- Left-click or tap on the Internet Explorer icon you have on the lower side of the screen.
- Write the following into the address bar of Internet Explorer which is situated in the upper side of the window: http://update.microsoft.com
- Press the Enter button on the keyboard.
- It should ask you for a system check and in that case you should left click or tap on the Yes button to proceed.
- The next window that appears will check for any available updates on your system.
- Follow the instructions on the screen to install the latest Windows 10 Updates.
- Reboot the system and check again if the Ndu.sys blue screen pops up.
5. Use a different Internet connection
- 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.
- 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.
- Go to Settings > Update & Security > Troubleshoot.
- Select Reset this PC.
- In the newly opened window, select Keep my files.
- Select which Windows version you want to refresh > hit the Reset button.
- 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.
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:
- Download the Media Creation tool on an alternative PC.
- Insert a blank DVD or a compatible USB flash drive (4GB or more).
- Run the Media Creation Tool.
- Go to Create installation media (USB flash drive, DVD, or ISO file) for another PC > hit Next.
- Customize your settings > select the OS version you want to install.
- Select USB flash drive or ISO depending on your media of choice >hit Next.
- Burn the files to DVD or create a bootable USB drive > Restart your PC.
- Press F10, F11, F12 to open the Boot menu.
- Choose USB flash drive or DVD-ROM as the primary boot device > hit any key to boot.
- Choose Advanced and format your system partition.
- 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.
FAQ: Read more about Ndu.sys error
- What is the Ndu.sys error?
The driver irql not less or equal (ndu.sys) is a BSoD error usually caused by incompatible hardware drivers and, to be more specific, the Wireless adapter driver.
- How can I fix the Ndu.sys error?
First, rename the Ndu.sys folder and then install the latest network card drivers. If ththose didn’t work, try to roll back to a previous OS version, check for updates, use a different Internet connection, reset Windows 10, run the BSOD troubleshooter, and finally, clean install Windows 10.
- What is Ndu.sys?
Ndu.sys is a Wireless adapter driver. A driver is a small program that ensures the communication between your computer and your hardware or connected devices. A driver has direct access to the operating system and hardware, making it extremely important in the proper functioning of your computer.
Editor’s Note: This post was originally published in August 2018 and has been since revamped and updated in April 2020 for freshness, accuracy, and comprehensiveness.