However, the upgrade process to Windows 10 isn’t always smooth and some users report getting driver_irql_not_less_or_equal (mfewfpk.sys) error. Driver_irql_not_less_or_equal (mfewfpk.sys) is usually followed by a Blue Screen of Death after which your computer restarts. This error is caused by a file mfewfpk.sys that is related to McAfee Security Software, and usually, the best solution to this is to remove McAfee security software before upgrading to Windows 10. If you have already upgraded to Windows 10, don’t worry, there’s still a way to fix this issue.

How do I fix Driver_irql_not_less_or_equal (mfewfpk.sys) error?

1. Start Windows 10 in Safe Mode

If the problem is resolved after removing McAfee, you might want to keep using Windows Defender or switch to a different antivirus solution. Windows Defender offers solid protection, but if you want full system protection, it might be wise to install third-party antivirus software.

2. Move the problematic file to a different directory

After doing that, restart your PC and the problem should be completely resolved. Keep in mind that this isn’t a system file, so you can also remove it if you want. In most cases, this problem is caused by mfewfpk.sys, and in order to fix this issue, you need to find and move the file to a different location. This file is located in the Windows directory, but it’s not crucial for Windows, so you can easily move it.

3. Perform a System Restore

After performing a System Restore, your PC should be restored to an earlier state, and the problem should be resolved completely. Keep in mind that this isn’t a perfect solution, and sometimes even the System Restore won’t be able to fix your problem. Use a third-party system restoration tool You can also restore your system files using a third-party specialized tool, so you won’t need to use any System Restore and lose your current windows files and settings. SPONSORED Simply download the tool, run it, and it will automatically scan the system for corrupted, damaged, or missing files, then it will restore them or replace them accordingly.

4. Use Linux boot drive

If driver_irql_not_less_or_equal (mfewfpk.sys) error is preventing you from starting Windows, you might be able to fix the problem simply by booting from a Linux boot drive. This software can also help you by creating a restore point before starting the repairs, enabling you to easily restore the previous version of your system if something goes wrong. This is how you can fix registry errors using Restoro: As soon as the fixing process is completed, your PC should work without problems, and you will not have to worry about BSoD errors or slow response times ever again. ⇒ Get Restoro Disclaimer: This program needs to be upgraded from the free version in order to perform some specific actions. Keep in mind that in a Linux environment your drive might not be labeled as C, so you’ll have to find the Windows directory on your own. This is a bit advanced solution, so if you don’t know what is an ISO file or Linux, and if you don’t know how to create a bootable drive, you might want to read a tutorial or two or try a different solution.

5. Remove McAfee

Since McAfee is supposedly a cause of this error, removing the program is the safest solution. You can do it from within the device manager, or you can use a third-party app removal tool. To do this, you will need to download and run a McAfee removal tool. After you’ve downloaded the tool, you just need to run it and it will remove McAfee Security Software completely from your computer. If you’re getting Blue Screen of Death with driver_irql_not_less_or_equal (mfewfpk.sys) error then you probably won’t be able to access your system. To download the necessary McAfee removal tool, you’ll have to start your Windows 10 in Safe Mode. ⇒ Get IObit Uninstaller

6. Use Command Prompt to remove the file

This command will force Windows to remove this file. After doing that, just restart your PC and check if the problem is resolved.

7. Use Windows 10 installation media to perform Automatic Repair

If you aren’t sure how to do it, know that you can learn how to boot from a USB drive with our useful article. Just follow the steps and you’ll know how to do it in no time. Note: Before you start, you need to download Windows 10 ISO using the Media Creation Tool and create a bootable drive. You can do that from Safe Mode or from a working PC. We hope these solutions helped you with Driver_irql_not_less_or_equal (mfewfpk.sys) error, if you have any questions, or comments, just reach for the comment section below.

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