Prblm: AutoCAD alert, config files locked

Dear subscribers

There is a problem with a few of the Architectural Desktop 2004 (ADT)
installations at the school where I administer the computers. When some of
the students start ADT they receive the following error:

AutoCAD alert

Configuration file may be locked by another process or have been set Read
Only(.cfg, .bak).
Correct problem and Retry or Cancel to error abort Exit.

If the student presses the Cancel button, the following message was
received:

AutoCAD Error Aborting
FATAL ERROR: Unhandled e06d7363h Exception at 77e73887h.


The computers are running on Windows XP Pro computers (Swedish version) and
ADT is distributed through Active Directory's group policies, i.e. the
software is assigned to the computers via a gp. The only other software on
the machines is Office XP and Adobe Acrobat Reader 6.0. It's not all of the
students who have this problem, but the students who has it, has it every
time.

Any help with this problem would be greatly appreciated.

Kind regards, Ola Theander