PC keeps crashing, stopping, and restarting randomly

My PC keeps crashing, stopping, and restarting randomly for some time now. I noticed a new user was made with an outgoing/incoming network connection allowed. I’ve attempted to resolve this in a lot of different ways, but whenever I restart, the malicious files get re-downloaded from another file, triggered from another, and it’s hard to locate them since files are renamed as legit Windows apps. Any tips on how to fight this?

Hey there!
Have you tried running an AV?