Sorry to hear that :-(Didn't you have somebody who could check if he'd managed to save some of it?
Talking of virus, spyware and other shit like that... Be prudent if you receive an email, facebook message and probably twitter message from one of your friend (in fact anyone who had your name in his contact list) telling you that he was stolen in a foreign country and need money to help him. This one run currently and some people I know were almost caught by this. The best thing to do is to contact the real person using a different way (if you get an email PM the person on a forum, ...)
Hold on. You mean, it was still getting into Windows at least? Oh, Pete, I guarantee that was retrievable. The only type of virus that should ever cause you to format is the type that stops the computer booting at all ("system disk not recognised", etc).Please, if this ever happens again, find some other terminal or person to get a message on here because there are several easy things to try first that we can help with.