PC gets transported to repair shop and is replaced with an highly protected windows 7 with anti hacking system and the best version of avast with all avast add thingies
Mac goes to pc's house and smashes it with a hammer until it's broken beyond repair and bombs every computer repair shop within a 100 mile radius of PC .
Mac hacks into a us military missile silo and launches 2 nukes toward PC's house. One explosion causes an EMP that fries PC's circuitry and the 2nd explosion flattens PC's house and everything within a 5 mile radius.