You know what they say, if you suspect your computer has gone rogue, you call the experts. And by experts, I mean the police.
Don't be afraid to dial 911 and say "Hello, I'd like to report my computer has taken control of my life." They'll know exactly what you mean.
Just imagine the look on their faces when you say it's possessed by an entity from the digital realm, demanding pizza parties at 3 AM and forcing you to watch cat videos.
Disclaimer: Do not actually call the police. They will not be amused.