Vista - Device Manager is empty

Using XP Pro as an administrator. Experiencing 3 problems: 1) Device
Manager is empty in both normal & safe modes, 2) F8 will not take me into
Safe Mode but MSConfig will, & 3) Computer folder that shows drives display
takes a while to load but eventually does load ok. Otherwise everything is
functioning ok. 2008 Norton is installed, up to date, & fully scanned. Plug
& Play is automatically started. When Device Manager is selected the
following Device Manager message displays: “You do not have sufficient
privileges to uninstall devices or to change device properties or device
drivers. Please contact your site administrator or logout & log in again as
an administrator & try again.� In the registry under
HKEY_Local_Machine/System/CurrentControlSet/Enum Permissions for Enum Screen
already has displayed: Both System & Administrator have Full Control & Read
with Advanced Security Settings for Enum screen as Not Inherited Apply to
this Key & Subkeys, Everyone has read with Advanced Security Settings for
Enum screen as Not Inherited Apply to this Key & Subkeys. Please help
resolve the above problems. I’m a novice so guide me gently.
--
Thank You, Bevy_Jeter