SOLUTION:Here is an easy solution to get back those files.just follow these steps................
(1)Connect your pen/flash/external drive to your computer.
(2) Go to My Computers and check what drive it is assigned for example F: or G: drive. Lets assume its G: (replace it with correct letter as applicable in your case).
(3)Click on START MENU –>”RUN”–> Type cmd and hit OK. This will start command promt.
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(4)Enter the following command and hit “Enter”.
attrib -H -R -S /S /D G:\*.*
(5)Now Eject your flash/pen/usb Drive and connect again and SEE MAGIC!!!!!!!!!!!!!!!!