Sounds like a bad heat sink. Dell has had a lot of those. However, if you think it is Maleware, either Maleware Bytes or Kaspersky are the best tools for it.
dell also had issues with bad solder.....
I had a dell burn up on me from overheating and the bad solder..
I bought a little fan unit you put the laptop on top of...
for about 40 bucks it is a great insurance policy
Maybe the free stuff works, but I prefer the updates and support of a highly regarded anti-virus/firewall like Kaspersky. I've had zero problems since.
We went to Malware bytes, no help.
This thing is clearly a program that generates complex information, not just some accidental failure.
Also, I ran a dos autocad rendering on the machine and it displays perfectly.