With Enable Advanced File System Security Options,This will further secure your windows explorer and not really a performance tweak. Open registry by going to START-RUN and entering regedit. Navigate to [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa] . In this look for value of "forceguest". If available, its default value would be 1. Set its value to 1. This would enables Windows XP logic for advanced permissions.