access denied after changing default domain GPO

From: richard (anonymous_at_discussions.microsoft.com)
Date: 02/04/04 

Date: Tue, 3 Feb 2004 15:12:56 -0800

On my win2k domain controller, after updating the default
domain GPO security settings, (via Windows XP client mmc)
I now receive an Access denied message when trying to
change any other subsequent security settings. Can anyone
think what may have been changed that won't allow me to
change other settings??

thanks,
richard