Easy to prevent pendrive's virus...
If the pendrive is fresh, u can put a folder named autorun.inf in the root of it. When the virus is gonna to copy itself as autorun.inf, it can't because same name!!!! Yeah!
(Do this on harddisks also)(It helps me prevent many time from infecting)

If the pendrive is suspicious, you can google Autorun Preventer and run it.
It will removes autorun.inf file.

This post has been edited by kingkingyyk: Jul 23 2009, 12:09 AM