I literaly can't do anything, it has shut down every control I had. I can't even open task manager.
I've had this same thing with my computer.
You need to reinstall your Operating system... To do this, you will need a re-install CD. Put it in your computer, turn off your computer, turn it back on. Then, before XP boots up, press F1 and go to system>boot sequence. Put the CD drive at the top of the list. Save settings, turn your computer off again, and turn it back on.
This
should boot of the disk, and it will wipe out your system of ALL your programs and files... including your virus.
Sorry if I explained it badly, but this is the only way. There is more info on the Microsoft website...