Administrator <--> USER with Administrator rights

Hi,

On two laptop compuers WinXp Pro Sp2k I have a strange problem.

When a user XYZ logs on (to the domain user account he is assigned) and
prints a document he shows up in the print queue as Adminstrator, the next
day XYZ logs on in exactly the same way but appears as XYZ in print queues
on the network print servers.

The user has administrator rights on the pc in question. Checking under docs
& settings reveals that the user actually has its own folder XYZ with all
necessary .... More than this, he has no access to the administrator docs
and settings.

Any ideas why this is happening (since it is quite obvious I don't want a
normal user appearing as domain or enterprise administrator account...)

regards

david