Logon automatically logs off for most users

At work we recently had our only domain server, a Windows NT 4.0 server box fail quite badly.  We only had data backups, so we had to reconstruct the domain from scratch and reconnect all of the clients.  Because the new server has not yet arrived, we are currently using a temporary Windows NT 4.0 server box.  As any IT person would know, reconstructing a domain from scratch is not pleasant, particularly reconnecting the 50 or so clients.

Most of the problems we have been able to solve ourselves, but one fairly old, Windows 2000 Pro laptop refuses to work now that we have connected it to the new domain.  I do not know if the domain change was the root of the problem or if the behaviour we are experiencing has some other cause.  Some posts on Experts Exchange seem to suggest the behaviour may be virus related.  

The computer in question allows the local Administrator to logon as normal.  It also allows one of our Domain Administrators to logon to the domain as normal, however, no other domain user, be they a domain admin or just a domain user, can logon to the laptop.  Whenever an attempt is made, the computer goes through the screens ‘Loading your personal settings…’, ‘Applying your personal settings…’, ‘Saving your settings…’ and returns to the ‘Press Ctrl-Alt-Delete to begin’ screen.

Any help would be much appreciated.
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AlanKingsleyAuthor Commented:
I managed to solve this one myself.  The domain change had nothing to do with the problem, and it wasn't a virus.  The owner of the laptop had attained local Administrator privileges and changed the permissions on the C drive to only allow the local Administrator, System, himself and one of the Domain Administrators full permissions.  Adding ‘Everyone’ back to the C Drive and giving ‘Everyone’ full access permissions solved the problem.
a) Add ‘Everyone’ with full permissions and test by logging out and back in before removing all of the other users from the C Drive permissions list.  If you do not do this and you make a mistake, you could be permanently locked out of the machine!
b) Do NOT tick the reset child permissions under ‘Advanced’ when changing the security settings, as this will reset the security for ALL of the files on the drive recursively!
c) Note, changing the permissions on the C Drive will take quite a while to do, just sit tight and wait for a minute or two, or three, or four, depending on your machine.

I think that this information may be useful to someone else, so I would like to leave the question here.  How do I get my points back?
I answered my question myself. What do I do?

Post a question in the Community Support topic area asking for a refund, and asking the Moderators to close the question. You'll be required to post your solution in your original question. A Moderator will post a notice of your request which will give the participants 96 hours to object to the refund. Note that if it resembles one of the suggested comments, the likelihood is that your request will not be granted, but rather, the points will be awarded to the Expert who makes the suggestion. In your Community Support request, remember to post a link to the original question.

Closed, 250 points refunded.

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