About this tag
The mfewfpk.sys error is a known issue during Windows 10 upgrades, often causing a restart loop where the system fails to boot properly. This error is associated with Bitdefender security software, as the mfewfpk.sys driver is part of Bitdefender. Users may experience being unable to log in after a restart, with the system repeatedly attempting to upgrade and failing. Troubleshooting steps typically involve booting into Safe Mode, uninstalling Bitdefender, or using system restore to break the loop. The error highlights compatibility problems between third-party antivirus drivers and Windows update processes.
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Windows 10 Windows 10 Upgrade Loop
First off, let me say, not having the bugs worked out on this update is beyond annoying. Your scheduled upgrade is a failure and did not work. I am stuck in a perpetual loop. Initially, I was able to get in to my Desktop, make some arrangements, but I noticed that Bitdefender was no longer...- Julia Bell
- Thread
- driver_irql_not_less_or_equal mfewfpk.sys error windows 10 loop windows 10 upgrade won't install
- Replies: 8
- Forum: Windows Blue Screen of Death (BSOD)