SOLVED: Driver_irql_not_less_or_equal (mfewfpic.sys) Windows 10 error


Ivan Jenic
by Ivan Jenic
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As you know, Windows 10 is available as a free upgrade to all genuine Windows 8 and Windows 7 users, however, upgrade process to Windows 10 isn’t always smooth and some users report getting driver_irql_not_less_or_equal (mfewfpic.sys) error.

Driver_irql_not_less_or_equal (mfewfpic.sys) is usually followed by a Blue Screen of Death after which your computer restarts. This error is caused by a file mfewfpic.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 to Fix Driver_irql_not_less_or_equal (mfewfpic.sys) Error in Windows 10

Driver_irql_not_less_or_equal is a Blue Screen of Death error that will crash your PC and cause it to restart. There are many variations of this error, and these are the most commonly reported:

  • Driver_irql_not_less_or_equal (mfewfpk.sys) – This is just a variation of this error, and sometimes the problem can be caused by mfewfpk.sys. However, you can fix this problem by using one of our solutions.
  • Driver irql not less or equal mfewfpk sys Windows 8 – This error can appear on other versions of Windows as well. Many Windows 8 users reported this problem, but you should be able to fix it simply by moving or deleting the problematic file.
  • Driver irql not less or equal mfewfpic.sys BSOD – This is a BSOD error, and it’s usually caused by McAfee. To fix the problem, simply remove McAfee and check if that solves the issue.
  • Driver irql not less or equal tcpip.sys, rtwlane.sys, nvlddmkm.sys, netio.sys – Sometimes other files can cause this problem to appear. This types of problems are usually caused by outdated drivers, so be sure to update them.
  • Driver irql not less or equal overclock – Your overclock settings can sometimes cause this problem to appear. However, you can easily fix the problem by removing the overclock settings.
  • Driver irql not less or equal crash, blue screen – If this error appears, your PC will usually crash and give you a Blue Screen. However, you should be able to fix the problem using one of our solutions.

Solution 1 – Uninstall McAfee

To do this, you will need to download and run McAfee removal tool. You can download it from here. 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 (mfewfpic.sys) error then you probably won’t be able to access your Windows 10 and download McAfee removal tool, so you’ll have to start your Windows 10 in Safe Mode.

To start the Windows 10 in Safe Mode you usually need to restart your computer from Windows 10 while holding the Shift button, but since that isn’t the option you can try the following:

  1. While your computer boots keep pressing F8 or F2 or Shift + F8. This will sometimes allow you to access Advanced Boot Options. As we mentioned, this will not always work, but after your computer resets for several times you’ll get the option to Restart or to enter Advanced Startup. When this happens make sure that you choose Advanced Startup.
  2. Then choose Troubleshoot.
  3. Next, you need to go to Advanced Options > Startup Settings.
  4. When you enter Startup Option you’ll have the option for Safe Mode with Networking. Choose it, and download the McAfee removal tool from the link above.
  5. Run the McAfee removal tool to remove McAfee software completely.
  6. Restart your computer. After you’ve removed McAfee Security Software everything should be working as usual.

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 a third-party antivirus software.

There are many great antivirus tools on the market, but currently the best are Panda Antivirus, BullGuard and Bitdefender. All these tools are fully compatible with Windows 10, and they offer the best protection, so feel free to try any of them.


Solution 2 – Move the problematic file to a different directory

In most cases, this problem is caused by mfewfpic.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. To do that, simply follow these steps:

  1. Start Windows 10 in Safe Mode. To see how to do that, be sure to check the previous solution for detailed instructions.
  2. When Safe Mode starts, open File Explorer and go to C:\Windows\System32\drivers directory.
  3. Now locate mfewfpk.sys file and move it to a different location outside of the Windows 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.


Solution 3 – Use Linux boot drive

If driver_irql_not_less_or_equal (mfewfpic.sys) error is preventing you from starting Windows, you might be able to fix the problem simply by booting from a Linux boot drive. To create a Linux boot drive, you download Linux ISO on a working PC and then create boot drive using Rufus or any other similar tool.

After doing that, you need to connect the boot drive to your PC and boot from it. Once you start your PC in the Linux environment, you need to find C:\Windows\System32\drivers directory and move or remove mfewfpk.sys file. Keep in mind that in 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.

Editor’s Note: This article continues on the next page.