For me this is old news, i work for a local small town IT company maintaining most of the small business and home users computers.
There's a virus called OnlineGamesTrojan(by nod32 anyway) or something like that, that spreads like wildfire through the use of thumb drives, and like miltox said it hides itself in the recycler folder of all infected drives.
Its easy to remove, but not easy to contain the infection, people are just not careful enough. For the last year or what there's been pc's and thumb drives coming in my workshop with that bull**** infection.
Funny thing is, a lot of them gets infected through our local photo kiosk just down the street. I have even cleaned their pc's from viruses quite a few times.