is Folder Option Vanished in your PC?

1.  Go to your Start menu, click on Run and open up your Registry Editor by typing "regedit" without the quotes and pressing OK.

2.  Once there go to: HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folde r\Hidden\SHOWALL

3.  Delete the value CheckedValue. (Its type should be REG_SZ and data should be 2.)

4.  Create a new DWORD value called CheckedValue (same as above, except that the type is REG_DWORD) by right clicking on the right pane->New->DWORD Value. Modify the value data to 1 (0x00000001).

After this, it will let you change the "Hidden Files and Folders" option.