Click on search start button ==> type COMM
(Black Command Prompt icon will appear
Right click on that and Run as Administrator
Go to my computer and Find which drive letter is allocated to your pen drive i.e if that is F Drive
Go back to second step where already showing black screen and type there is f: Press enter button
Now your black screen will show f:\>
Type on black screen attrib -s -h -r /s /d (as follows)
Go back to your pen drive all the contents get display properly.