Do yourself a favour though, seriously, either get you machine formatted or do a thorough scan with a good AV and malware package. If you need a trial key for Nod32 I can give you a 30 day one, and Malwarebytes' Anti-Malware is free.
No point throwing good money after bad, as if you system is still compromised it won't be long before you new key ends up on the master ban index.