Solved BSOD kernel_security_check_failure 0x00000139 Windows 8.1

BDOD has always been an issue once in a month, but lately it is happening 2-3 times a day.

I'd be verry grateful if anybody could offer some help.

Move the files you need to an external drive.
Look for the recovery options available on Windows 8.1.
Make a new CLEAN installation by selecting Remove everything and reinstall windows.
If you do everything correct the PC will run like new.