Possible Virus?

The AC adapter gets hot (it's a Dell), but other than that the laptop itself doesn't get warm unless I've got it on for days at a time, which I don't do since my last adapter broke.

Downloaded whocrashed, and no result came up.

That's weird, are crash dumps enabled for your computer?

Also you can try running Spybot and see if it pics up anything: http://www.safer-networking.org/en/index.html

Also you can post a hijackthis log and post it back here: http://sourceforge.net/projects/hjt/

Virus scan with your antivirus(unless you're only using defender), make sure the definitions are up to date.

If you don't have one, you can try AVG free here: http://free.avg.com/us-en/homepage or Avast: http://www.avast.com/en-us/index