05-11-2016 12:16 AM
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  1. Windows Central Question's Avatar
    Installation went well and everything looking good until next day when I changed my Region and language settings. after re starting I got the message DRIVER_IRQL_NOT_LESS_OR_EQUAL (epfwwfp.sys)
    This is on Dell xps15 laptop.
    The system went through all the troubleshooting steps with the same result. Tried to rest but same outcome. Laptop cannot start. Please help
    07-30-2015 08:38 PM
  2. zFcBoxhead's Avatar
    Same issue here. Downloaded Windows 10 when I got the prompt and worked fine for 2 days until there was no sound and I did a restart to see if it would fix the problem but now I get the same error and can't start the computer without going to the blue screen. This is on an Acer Aspire TC-605.
    07-31-2015 05:21 PM
  3. WardoAnguiano's Avatar
    same here. I you guys find a solution please met me know. I hate windows now...
    07-31-2015 10:49 PM
  4. Diego Angarita Berdugo's Avatar
    DEL /F /S /Q /A "C:\Windows\System32\drivers\epfwwfp.sys"
    08-01-2015 10:54 AM
  5. Mckittric Torralba's Avatar
    That command works.thanks man.
    08-01-2015 03:55 PM
  6. djlondon22's Avatar
    Sir, you are a genius, it worked a treat, thank you so much.
    08-06-2015 04:18 AM
  7. Rodolfo Semedo's Avatar
    Press F8 when pc start - advanced opcions - troubleshoot - advanced opcions - command prompt
    Good luck
    08-06-2015 06:04 AM
  8. Cristian Lloyd's Avatar
    Gracias, el comando funciona, en modo seguro lo ejecutas y listo
    08-06-2015 11:22 AM
  9. supersnuggy's Avatar
    I tried this command prompt and nothing is working.
    08-06-2015 05:28 PM
  10. supersnuggy's Avatar
    Do I need to type in del fsqa before the command prompt? Thanks in advance.
    08-06-2015 05:32 PM
  11. Ely Abraham's Avatar
    Command works like a smooth charm.
    08-06-2015 08:49 PM
  12. Gila Eremenko's Avatar
    DEL /F /S /Q /A "C:\Windows\System32\drivers\epfwwfp.sys"
    . Where i should tio type it? How i open it?
    08-07-2015 08:23 AM
  13. Gila Eremenko's Avatar
    Where a command promt is?
    08-07-2015 08:24 AM
  14. Todd Curtis1's Avatar
    All I get is,

    My laptop says could not find DEL /F /S /Q /A "C:\Windows\System32\drivers\epfwwfp.sys"
    Last edited by Guytronic; 08-08-2015 at 08:09 PM.
    08-08-2015 07:17 PM
  15. Chas C's Avatar
    Had same problem, worked well then trouble. Suggested solution did not work and had to go back to W8.1.
    08-09-2015 07:16 AM
  16. Elizabeth Rodriguez5's Avatar
    Help... I entered the suggested command but i too am getting that it could not find
    08-10-2015 09:32 AM
  17. Elizabeth Rodriguez5's Avatar
    I too am having the same resoonse
    08-10-2015 09:34 AM
  18. HammerBlow's Avatar
    Worked great for me. For those not sure:

    Press F8 when pc start - advanced opcions - troubleshoot - advanced opcions - command prompt
    Good luck
    Followed by:

    DEL /F /S /Q /A "C:\Windows\System32\drivers\epfwwfp.sys"
    One thing to bear in mind, if you main windows drive is not C, change it to the correct letter :)
    08-12-2015 06:52 PM
  19. KidZoom's Avatar
    Caused by eset firewall protection. Can use ren command as opposed to del command. Open the driver folder as administrator, change epfwwfp.sys to epfwwfp.old. Either way it disables eset firewall. Can ren back to sys after a few restarts. Or reinstall eset.
    08-12-2015 11:13 PM
  20. Jensbest's Avatar
    What if you can't use the command prompt or type anything in? It is a blue screen with options to continue to
    windows 10 which doesn't work. I just updated windows 10 and was using photoshop when it happened. I can't lose my work. It just occurred to me that it could matter that I have a lenovo laptop?
    Last edited by Jensbest; 08-13-2015 at 08:11 PM.
    08-13-2015 07:57 PM
  21. Jody Green's Avatar
    I upgraded from win 8.1 to 10 on my dell all in one desktop on Wednesday. It worked fine Thursday but this morning when I woke up, my computer was at the new blue screen of death. I noticed the error DRIVER_IRQL_NOT_LESS_OR_EQUAL flash briefly each time it rebooted. I found this thread from another computer and was hopeful that the del command would work.

    I opened the command prompt and it took me directly to the folder


    I typed in the del command line as specified in this thread and it did not find the file epfwwfp.sys. I did a dir *.sys in this folder and found only two sys files, neither this one. Anyone have other thougths?
    08-14-2015 03:21 PM
  22. dennis lupatsky's Avatar
    I don't have the file either. I upgraded to windows 10 weeks ago. This issue just started yesterday for me? I have a Dell Desktop as well. The only other symptom is, it won't reboot by itself. It stays in the blue screen. It says it's 100 percent finished but nothing happens. I have to hold the power button in until it shuts off. But my computer works. (I'm using it now) But sooner or later I'll get the blue screen saying Windows encountered a problem and has to restart.
    09-15-2015 05:54 AM
  23. Alekh Sahoo's Avatar
    when I open camera and take some image then close. immediate window show me IRQL_NOT_LESS OR EQUAL ERROR and restart....please tell me how to solve this problem....
    09-19-2015 02:29 AM
  24. Braie's Avatar
    I keep receiving the following message on command prompt when using what you recommended PLEASE HELP
    Parameter format not correct -

    I'm sure I'm not using the command right please reply as soon as possible thank you so much.
    09-20-2015 01:29 PM
  25. Timkok's Avatar
    I received this error in the first boot after upgrading to Win10 but the file name in parenthesis was mfewpk.sys. Thanks for the tips here I could fix the problem. I, however, did it so that I somehow could start Windows on safe-mode and then I went to the folder C:\Windows\system32\drivers and located the file mfewpk.sys. I moved this file away to other folder (needs administrator rights). Then I restarted my laptop - and WAU - everything works fine now.
    10-11-2015 01:27 PM
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