|If it's on the memory stick then plug in the stick, go to "Computer" and right-click the USB stick and choose "Format".|
If the virus is on the computer, try scanning the computer for viruses. I usually don't use online scans unless they are from a trusted company like Avast! or AVG.
The only way to completely eradicate a virus is to reformat the hard drive, since anti-virus programs only detect known virii and some viruses can get around them.
I.T guy gone rogue.