I would like the rights issue too except all of our users are setup as administrators of their own machines. This was done historically so we wouldn't have any of those kinds of issues but likely should get changed going forward.
We typically setup new users from scratch as well but in this case we wanted to move the profile over to verify that the issue was hardware related to the old machine and not software related. We have now determined that it isn't hardware related and the problem lies in the windows profile itself. Of course this machine was working fine for many months until something went wrong. We did look through the windows event log just before it stopped working properly but there was nothing that stood out.
Anything we can look at or test on the machine itself?