Dell Optiplex not shutting down?

On a Dell Optiplex, it takes more than 5 minutes to shut Windows XP Pro down. Even pressing the power button results in almost no action for 60 seconds before the log out starts!

Latest Service Pack, ALL the Windows Updates to date
Things tried:

HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Control/WaitToKillServiceTimeout set to 200

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management was already set to 0


~ by nambabwe on 2011/08/12.

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