My mate's dad got this virus and I spent a day there (I wasn't dragging the job out so I could stay at his house for BBQ chicken tea, honestly!) and couldn't fix it. I tried literally everything, and I took my laptop as well so I could search.
The virus in question was the 'Antivirus 2008/9' mentioned by Dack above. Have you already tried his advice?
I'm about to try it, if it lets me.
QUOTE(Trolly @ Sep 21 2008, 06:40 AM) Well, if it keeps on blue screening and doing in your anti-virus programs, just back up the safe stuff on an external hard drive or USB stick as quickly as you can, then re-format your hard drive and re-install Windows. Will save you ages of faffing about, I guarantee.