To unhide folder from "Computer" or "Pendrive" type this command in command prompt in windowsXp and windows7
Command:  Type ATTRIB -s -h -r c:/*.* /s /s and press enter to execute the command. 
This command execute few minuets.
Now see the affected folder,its show the affected hide folder.

Hi Guys,
Join Microsoft Virtual Academy and learn about microsoft Technology and then free course and materials available.
Link :  https://www.microsoftvirtualacademy.com