How to Fix DRIVER_IRQL_NOT_LESS_OR_EQUAL (Epfwwfp.sys) Error on Windows?


Issue: How to Fix DRIVER_IRQL_NOT_LESS_OR_EQUAL (Epfwwfp.sys) Error on Windows?

Please tell me if it’s a serious problem to get BSOD when booting the laptop? I assume that it is… This happens several times a week. The title of this blue screen says: DRIVER_IRQL_NOT_LESS_OR_EQUAL (epfwwfp.sys). After a minute or two, the diagnostic window shows up, but in the final it says nothing except to restart the system.

Solved Answer

DRIVER_IRQL_NOT_LESS_OR_EQUAL (Epfwwfp.sys) is a BSOD (Blue Screen of Death), which is triggered by malfunctioning epfwwfp.sys file. Although it typically shows up on PCs and laptops running Windows 8/10, Windows 7, XP, and Vista may also encounter this problem. Epfwwfp.sys or ESET Personal Firewall driver is a constituent of ESET Smart Security. Obviously, the error error window is triggered by ESET antivirus or, in particular, a mulfunction of epfwwfp.sys driver. Sometimes, DRIVER_IRQL_NOT_LESS_OR_EQUAL (Epfwwfp.sys) error shows up when performing everyday tasks, such as installing a new program, playing games, and so on. However, this error usually occurs when booting the system. Luckily, it’s not difficult to fix DRIVER_IRQL_NOT_LESS_OR_EQUAL (Epfwwfp.sys) error, so we will briefly explain how to do that.

How to Fix DRIVER_IRQL_NOT_LESS_OR_EQUAL (Epfwwfp.sys) Error on Windows?

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DRIVER_IRQL_NOT_LESS_OR_EQUAL (Epfwwfp.sys) error emerges due to the failure of ESET driver, which starts automatically along with the Windows system. Therefore, one of the solutions would be to remove Epfwwfp.sys file. To do so, boot up your system in the safe mode.

  1. Restart your PC two times in a row so that Windows show you Advanced boot options.
  2. When Advanced Options window shows up, select Safe Boot.
  3. After that, click on Windows icon and type cmd to open Command Prompt.
  4. Right-click on the Command Prompt option and select Run as Administrator.
  5. Type DEL /F /S /Q /A “C:\Windows\System32\drivers\epfwwfp.sys” in the dialogue box and press Enter.
  6. Finally, reboot the system.

This command will cause epfwwfp.sys driver removal, what should be sufficient for DRIVER_IRQL_NOT_LESS_OR_EQUAL BSOD Fix.The next step is to Uninstall/Reinstall ESET. For that, you have to:

  1. Open Task Manager by clicking Ctrl + Alt + Delete simultaneously.
  2. Find running ESET process, click on it, and select End Task.
  3. After that, right-click on the Windows icon and select Control Panel.
  4. Select Uninstall a Program under Programs and locate ESET on the list.
  5. Click on it and select Uninstall. If you opt for the same antivirus, download it from the official website and install it one from scratch.

If you have reinstalled ESET, but DRIVER_IRQL_NOT_LESS_OR_EQUAL (Epfwwfp.sys) still appears on your device, then we would highly recommend you to install FortectMac Washing Machine X9 or another alternative PC optimization tool and run a scan with it. That’s because ESET driver problems may be caused by outdated registries, file leftovers, malware, and similar issues that can be fixed automatically by the program mentioned before. If you did not managed to fix Blue Screen DRIVER_IRQL_NOT_LESS_OR_EQUAL (Epfwwfp.sys), let us know and we’ll try to check your case personally.

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About the author
Linas Kiguolis
Linas Kiguolis - IT professional

Linas Kiguolis is a qualified IT expert that loves sharing his excellent knowledge about problems in Windows and Mac operating systems. Linas’ insights often help other team members find quick solutions for visitors of UGetFix site.

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