See the self-help removal guide for Antivirus 7, a rogue program:
You need to download and use Rkill and MBAM. Give it a try.
Don't install Microsoft Security Essentials if you will keep Spy Sweeper with AV. You must not use two AV at the same time.
I have recently been attacked by a virus/malware program that masks itself as an antivirus program through windows called "Antivirus 7." It's detected by Webroot's Spysweeper & Antivirus which I have installed, but only through the cookies it creates and occasionally finds the trojan titled "Mal/ObfJS-CM." It seems to continue to replicate itself, despite attempts to delete any files that have that name on my system. It seems to attack the Win32 system files every time the computer is on, causing an eventual crash in the system (surprised it hasn't done it yet this session!) On top of that, using Google or any other search engine is almost futile as any link you might click will most likely re-route you to a completely different, ad-infested website. Any advice on this one? Webroot's Spysweeper isn't cutting it and I just downloaded Microsoft's Security Essentials to see if that will do the trick...