Hey,
I've faced this problem many times that is why I'm sharing it with you!
The problem is that many time after removing virus from a removable drive (such a pen drive) we are unable to open it! i.e, explorer is prompting "OPEN WITH"! Here is the solution of this problem!
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Simply go to DOS and then type the drive letter i.e, the drive path [If it it Removable disk (j: ) then type j: - Follow the total instruction below.
c:\>j: <enter>
j:\>attrib -s -h <enter>
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Now go to My Computer and right click on your removable drive and explore. There you will find a file named <autorun.inf> simply shift delete it! Then exit dos by EXIT command, Remove your drive and reinsert it, Now it is usable again!
Thank You!
Pankaj!