The point where you are so fed up with your high-speed computer being stupidly slow because of all the viruses you've picked up, half of them being virus-stoppers themselves, that your anger bursts and you ultimately DESTROY your computer's monitor, and kick the computer section underneath to death.
Friend: "What's wrong?"
Friend at computer: "My computer's being TOO F-ING SLOW!!!"
Friend: "Why don't you walk away?"
Friend at computer: "BECAUSE IT'S TOO F-ING SLOW!!!"
Friend at computer: "I CAN'T TAKE THIS ANYMORE!!! ARGH!!!"
Friend: "Dude, calm down."
Friend at computer: (looking insane)"Must... destroy... AAAAGGGGHHHH!!!"
*throw heavy magnet at monitor in frustration, then kicks that crap out of the computer box*