A while back I had a virus and had my computer fixed. Ever since then, gunbound doesn't work. I try to get in but my computer restarts on me. When it gets back up it says something like Error: the computer has restarted from a serious problem. Reinstalling it won't help and I can't think of a good reason why it's doing it. If you know why it's doing this, please post how this can be fixed.

Your Norton may be blocking the gameguard system (if u got norton).
I can't recommend other than check your gameguard/norton (or other protection system) programs. Turn ALL firewalls etc. off.