A recent discussion like yours is at https://toolslib.net/forum/viewthread/282-critical-process-died/ which they found lots of bad things.

Bad things can cause untold errors so you must do a few things first.

1. Backup what you can't lose. Why?
Many of the bad infections are booby trapped and can wipe the drive when triggered.

2. Keep cleaning with other tools. There is no one tool that rules them all. Once a machine is infected you will see many many errors. Your new folk working on this may ask why this or that error. The answer is simply "the PC is infected."