No idea if this is still open or not since OP has not replied but I think I would offer my advice. Those fake anti virus programs that appear on your computer are there due to a downloader virus, which I think might be called a "Trojan Downloader".
There are few ways to get rid of it. First off you can try a few programs that can remove it, sometimes there is malaware and spyware that is located somewhere in your system 32 that makes the program run and stops the script for the deletion/uninstalation of the program. The system 32 directory is the largest directory in your computer and is stupid going through it and look for it...However there are programs that can help you with this...
PC Tools Spyware Doctor
Spybot-S&D
Adaware pro
these three programs are the ones I use and I haven't had a virus in years...literally. You can also use a virus program, as such as Trent Micro and Kaspersky Pure (I have both) and they work really well..
If worse comes to worse, back up all your important files on a USB stick, scan the USB on another computer OR make a .RAR file of your important files to make sure the virus cannot get out. Then once thats done, just reformat your computer and all should work file. And atleast I hope it works fine. If not then your on your own kiddo.
Posted on Monday, 16th August 2010