how can I remove my virus?

My computer has a virus, and I already have a virus detector, Spyware detector. I have managed to stop the virus being so serious, but I still cannot download the Microsoft Malicious Software Removal tool, or any Updates. Im Running Windows Xp by the way. Every Time I do a full scan it finds a Rootkit Virus. Also when I start up windows, a RUNDLL window pops up saying something along the lines of Error Loading C:WINDOWSsystem32qyjxumt.dll
The Specified Module Could not be found.
Any help would be appreciated

It fairly a common virus.
you can use Registry Easy remove it and fix your corrupt registry.
here free scan your PC

http://www.keep-pc-clean.com/

also you can google for other PC cleaner http://www.google.com/

(Spyware) (Removal) Free Download!!!