While trying to manually register a workstation I get the following error

The workstation registration process has aborted because the user doesn't
have sufficient rights to the registry. Contact your administrator.

Also fails when trying to unreg.

When setting up a workstation (Win XP Pro, Zen 6.5) I set the user as an
Admin thru DLU. But after finishing I give them User rights. They have
full rights to the program files dir and full rights to both software keys
in the registry.

Is there a registry key I can give them admin right/s to additionally, or
can I only reg/unreg manually as an Admin?