Have you recently downloaded any pictures with the extension .exe? lol Listen I say there is a good chance it's just a trojan so get a firewall and a cleaner and stay DISCONNECTED cause if it is a trojan and someone means business it aint a thing for them to wipe your drive. This is no big deal really just take precaution. You could also log his IP and later resolve it, record the time of attack, and contact his ISP with the information and violation. Assuming, of course, that is the case.