Well... I might as well contribute to my own post
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The worst thing that's happened to me on the computer was that my XP spontaneously decided to pretend that all the user information (You know, passwords, start menu, desktop, etc.) was now supposed to be in a different folder. So I ended up having to reinstall Windows... I blame the fact that the computer once had Vista (No seriously! If Vista had not been installed, that would no have happened).
@Fallen Star: I can't wait for SC2 either! Yay! Just hope it doesn't get delayed... and delayed... and delayed... and then put on "Indefinite Hold" like SC: Ghost was.