System restore... the virus will still remain. You will have to re-isntall windows. Maybe buy a copy of windows 7 if you can afford one or just get another copy of Vista. Personally i would opt to go windows 7. The best way to get rid of a virus that has entered deep into the system files, is a fresh clean copy of windows. The virus effects system files which are mostly left unchanged in system restore, but you should obviously try that. Once you get rid of the virus either by re-installing windows or somehow by system restore i recomend using Avira Antivirus as you can obtain a legal copy