A friend's computer got infected with XP Antivirus 2008 last year, after looking up on how to remove it, none of the registry keys or system-looking files that all the pages kept telling me to remove where there. Except for one class ID that would reappear every time the system started. To fix this problem, I made a "vundo patch" program that would remove it after startup, this prevented it from hooking IE, allowing for smooth surfing.
But last week his infection grew to XP Antivirus 2009. I'm assuiming this is an invisible undate feature of vundo. Well, again, I looked up how to remove it, and the same problem. None of the keys or files where there, not only that, removing that class ID no longer did the trick.
How do you remove a virus that "isn't there"!?