2 out of 3 of our computers are now infected with some sort of nasty virus. The computers are inoperable even in safe mode. I cannot clean the computer without your help, what can I use to remove whatever was installed?
What would you use?
I've gotten a new keyboard for one computer to test if that would have been the problem. I've removed the jumpers as well to test.
One computer is a laptop the other desktop.

I can be 99% sure that it was a Limewire file that infected the computer, since the teen uses the site daily to download songs. My computer, that nobody is allowed to breathe on is completely in tact. Neopets is the only other website used frequently and downloads aren't part of the usage there.

I'm thinking that I'll need a disk, since the computer won't respond to any user driven commands.

Thanks in advance...