After forcing a hard reset after my laptop hung up for a long time without any display it started trying to repair itself, unsuccessfully. It now permanently hangs up with the following message:
Recovery
Your PC/Device needs to be repaired
The Operating system couldn't be loaded because the digital signature of a file couldn't be verified.
File: \WINDOWS\System32\intelpep.sys
Error Code: 0xc0000428
You'll need to use recovery tools. If you don't have any installation media (like a disc or USB device). Contact your PC Administrator or PC/Device Manufacturer