If you had a non ecrypted wallet.dat on the compromised computer, transfer all the money you had there to a new secure wallet ASAP.
It wallet.dat was encrypted, first transfer it (and only it) to a secure computer. Than as skull88 said.
I have a wallet, but since I haven't started mining yet there are no coins in it.
Of f*** I so hate myself - I really don't want to reinstall Windows