Some files will be hidden from Users. If you want to see those files,you have to edit the registry. This hack will fit for both windows xp and Vista.

Go to Start-<run
Enter as Regedit
Navigate to

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced

In the right panel ,you can see the superhidden registry
Right click on the SuperHidden
Change the Data value to 1.
Click ok
Exit the registry and restart the windows.