[spacewarp]

Ummmm. Open the cover on the PC, pull out your vaccuum cleaner and remove the thick coating of dust from your power supply that is probably causing your system to overheat and shut down.

Paul

[VOA]

Open the cover on the PC, pull out your vaccuum cleaner and remove the thick coating of
dust from your power supply that is probably causing your system to overheat and shut down.

It could be that you've "cut to the chase".
This would be something that should be tried before spending long hours on
attempts to see if malware is the problem.
Especially if the computer is even a year or so old...and/or
in a location prone to lots of dust accumulation (e.g., sitting on the floor).

(Of course, I have an excuse for not recollecting this smart first move...
"I'm just a novice"!)