Few days back I came across a trouble with my pen drive.
When I connected the pen drive into my computer, the icon if the drive looked like a folder rather than a drive. Obviously it was a virus problem. I scanned it with Avira. But it could not find any infection though it was up to date. Then I tried Smart Virus Remover . It scanned the drive and deleted the autorun.inf file. Then the icon was changed.
So if ever you face such problem then you may try the above.
Just download the Smart Virus Remover from here.
Install it & click on delete autorun.inf files.
Your drive will be scanned and Smart Virus Remover will delete the aurorun.inf file from it.
You have done. Just unplug the usb drive and reconnect it. ( Sometimes you may need to restart the computer.)
You will see your icon restored.