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BAD_POOL_CALLER (mfesapsn.sys)

Every time I try to log in my computer blue screens and shows this error. Most people seemed to uninstall McAfee to fix the problem but I can't get the chance because of how frequent this crash happens.  
Answer
Answer

That link worked great.

The issue you are having with McAfee is most likely that the Driver Verifier has been enabled and it is causing the mcsacore.exe (McAfee process) to crash with the mfesapsn.sys on login.

Disabling the Driver Verifier should stop this McAfee crash on login.

To disable the Driver Verifier do the following (either in Normal Mode or Safe Mode) :

Windows Key + R > type verifier.exe in the "Open" box > OK > Delete existing settings > Finish

Restart the computer.

Did someone enable the Driver Verifier because of a previous blue screen issue?

Some earlier minidump files showed a KMODE_EXCEPTION_NOT_HANDLED (1e) which appeared to be caused by the bwcW8x64.sys.

The bwcW8x64.sys is a driver for the Killer network adapter so I might suggest to update this driver - here is a link to the latest driver:

http://www.killernetworking.com/support/driver-downloads/standard-drivers

Or you could try MSI (On-board LAN) :

https://ca.msi.com/Motherboard/support/970-GAMING.html#down-driver&Win10 64

I might suggest to remedy a blue screen issue with the Killer card to uninstall the Killer Suite and just use the driver only package.

There are some other potentially problematic drivers so if you still have blue screen errors afterwards post back.

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Last updated January 18, 2023 Views 2,932 Applies to: