Enable Folder Options

Try This

Go To Start -> Run

Type "regedit" without quotes

on the left frame u'll see the options
follow the path

HKLM\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folder\Hidden\SHOWALL
Delete the value CheckedValue. (Its type should be REG_SZ and data should be 2.)
Create a new DWORD value called CheckedValue (same as above, except that the type is REG_DWORD).
Modify the value data to 1 (0x00000001).
This should let you change the "Hidden Files and Folders" option.