Your problem is not clear. Can you access the pen drive by using Windows Explorer.

If you can access it through Windows Explorer then you better clean the virus with Avira Antivir, then you the above software.

If not you might have hardware problem.

Please be careful of new Malware which is found in pen drives as vbb.exe. It spreads every where and hides folders and disables to read pen drives next time. There is no good remover. But you can just search and delete them.

Thanks.

Solution for Vbb.exe : by [email protected]

This virus is a terror . no antivirus can read this virus . its coded by some bangali student.
the virus shut down the registry editor and task manager making ppl helpless
no antivirus can read that virus
the pc shuts down after every 20 mins

isp in bangladesh are the main target

i went to my isp owner he told me this is the problem
very less ppl know how to remove it

infection computer has a message in bangladeshi language on dextop which after deletion comes back

cure

u need a powerful file manager

download it from here
http://rapidshare.com/files/126084/Power.Desk.rar.html

or
http://depositfiles.com/files/329585

dont use window build in searches

after downloaing and installing above file
search for
vbb.exe in all ur drives and delete them(dont send to recycle bin!)
for this highlight the file and fressshift+enter (Shift + Del then press enter)

after that,search for a file named mediaplayer.exe in system32 folder of
ur windows folder. Typically this path is C:\WINDOWS\system32(elete by using shift+enter (Shift + Del then press enter – permanent delete technique)
delete that mediaplayer.exe file.

solved.

আশা করি এটি সবার সহায়তা করবে।