I work for an IT Support company called Appiam. I recently had the dreaded Antivirus System Pro virus. It wouldn't let me run anything and by anything I mean it stopped, rundll32, regedit, cmd, .exe files, you get the picture.
I followed the guide on the link from your site: http://www.bleepingcomputer.com/virus-remo...irus-system-pro, i managed to download the rkill.com program but it would not run. Was just about to rebuild it when i had an idea.
Right click and run command.com as an domain administrator. It worked, still got the "command.com is infected do you want to install antivirus" but it stayed up. from here i could run all the above. went to the desktop folder and ran the rkill.com - it worked.
Ran malwarebytes as well.
So if you get this issue just right click any application and run as domain administrator and it will work.
hope this helps anyone out there who has this issue.
EDIT: Commercial link removed~~ Moderator
Edited by Grinler, 27 November 2009 - 08:22 AM.