my computer had one of those rogue anti virus programs installed onto my computer automaticly before...when you'd open internet explorer the anti virus would pop up a window saying that i had infected stuff on my comp. also, one day i was searching on lime wire and found something that i decided to download, when i logged back in on the computer, it would say that windows will shut down in X amount of seconds. I was like *CR*P!*

(now i never trust limewire.) those are the only two that's ever happened.