|We can't say for sure right now if the computer is really working.|
Might borrow any vista or windows 7 dvd from someone and see if you can get to the install screen.
XP may need drivers slipstreamed in if they even exist at all.
I would see if the maker offers a cheap restore disk to return it to Vista like you bought it. Some offer dvd's for like $20.
I support the 'Everybody Draw Mohammed Day'. A religion doesn't deny my freedom.