Poweruser set yet "Failed to update the system registry"

I just upgraded one of our older workstations to Windows XP.
After installing Autocad 2002 and setting up the user with Poweruser
priveledges I still get the "Failed to update the system registry error." I
have not changed the usergroup's setting. Does anyone have any idea what
could be happening?

The only thing I've done differently than my usual setup is...

1) I setup a default user after configuring autocad from an administrative
account. When copying the user profile to the default I set the permissions
to /Everyone.

2) I copied the appload startup suite portion of the registry from another
computer so that I wouldn't have to select each one.

I've setup other computers that work fine with powerusers and these are the
only things I can think of that I have done differently. I've looked
through the newsgroups and can't find anything with this sort of problem.
Someone please help.

Luis