"Darkeforce" <Darkeforce@discussions.microsoft.com> wrote in message
news:5DFD6C37-5077-4154-9034-D5C9B14F2669@microsoft.com...
> Whenever I try to run the disk defragmenter, I get an error that says
> Access
> is Denied. There is only one user on the computer; I'm the administrator.
> How
> can I be denied from using that utility when I have full authorization to
> do
> everything on the computer?
>
> Windows XP SP2

How to reset security settings back to the defaults
http://support.microsoft.com/kb/313222