So I got some weird virus on this PC (Don't know how). It's some sort of msn virus which is spamming my contacts, whether I'm online or not. I've un-installed msn, re-installed it. Switched password, made a new account. No use. Then I've run 2 virus scans using Avira, it didn't detect anything, then I un-installed Avira and used AVG 8.5 Free, it detected 2 viruses and deleted them, but that little sucker (The virus) is still spamming my buddies over msn. I used Malwarebytes' and scanned twice, it found 4 things and deleted them, still no use. I've used 2 different MSN Virus Removal things, no use. So I'm asking you guys, what the hell am I supposed to do now? Just format the computer?