u do not have permission to update W XPP

We have a small Windows 2003 Domain (1 DC and a few 2000 and 2003 member servers) with XP Clients.

We have implemented Group Policy to lock down a number of permissions.

In the last few months I have noticed that a number of Windows Updates have not been installing properly using the Automatic Update Client. The client pops up saying that there are new updates, the user selects to install them, the client says that they are completed successfully, the user OK’s that. Next day, the same updates are there to be installed again.

I have tried to run the updates manually as a user, Domain Admin and Local Admin and with all users I get the error: