You may have a corrupt profile.
Try and log on as the hidden ADMINISTRATOR account and create a new user account with Computer Administrator privileges and try accessing the Administrative Tools again.
In XP HE on Startup press the F8 key several times and you will be able to boot into the ADMINISTRATOR user account.
If you've not set a password leave it empty and hit Enter/OK to sign in.
When I try to access any Adminstrative Service I get the following message: "Windows cannot access the specified device,path,or file. You may not have the appropriate permissions to access this item." I am logged on the administrator. Thanks, for any help.