That doesnt really solve the problem. There is alot of viruses going around and spreading via pen drives, Please Scan your drive with an upto date virus scanner. if you can access the pen drive using the start run method please go into your pen drive and then go to tools, Folder options, View, and scroll down and check the box next to show hidden files and folders, and scroll down a little further and uncheck hide protected operating system files. Click yes when a box apears. Go back to the pen drive and you should see an autorun.ini file delete this file.
Remove the pen and put it back in and your problem should be Solved