My hubby had this problem. It took me ages to sort it out.
Nothing stays open long enough, if it will open, to sort it out. I had to open XP in safe mode by continuously pressing F8 on start up. I followed instructions on how to use RKill found on this site. RKill stopped the virus from preventing internet etc from being opened.
I then downloaded Spyware Doctor anti-malware which I thought had sorted the problem out.
Don't reboot after using RKill or the virus might return, use Malwarebytes to clean it up first, I did this after I had run RKill in safe mode and also had to use RKill again followed by Malwarebytes in usual windows XP when the virus returned after computer had been turned off completely and restarted. The system is now clean and virus has not returned.
Also, something called BADARemote seems to carry viruses, when I cleaned out the virus, the BADARemote icon was in my start up menu where the icon for the bogus security centre had been. I googled BADARemote and found others had had problems with it too, thinking it was supposed to be on the system. It is easily got rid of, I found instructions in google, will try to find a link for you if you have the same problem as we did.
P.S. trouble started with hubby clicking on a web link so make sure you have your security settings enabled to warn you of potentially danger in real time from such links.
Edited by Kat66, 27 February 2011 - 06:17 PM.