Yea I was gonna say.. Just redo Windows and it'll be perfect...
Bout $100 bucks and it'll be in brand new working order. Course that is with a system builders CD. Probably more for a retail version.
I'd ask the seller if he would be willing to half you for cost on a new OS, if possible. Or fork out the cash.
Btw (not to bash) But that computer was not worth the 700 you paid for it as far as I'm concerned... especially for having 512mb ram wow. Also, it looks to be a pretty old model of computer.