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.

Using secure system change all your passwords, when changing every password repeat "I will not open email attachments, I will not open email attachments, I will not open email attachments..."

haha +1