From what you have said, the only difference between the accounts is admin privileges? Can you try giving your user admin controls so that they can try running it from within their own account? Having checked some of the info that is given when you download they always recommend running the programme in full admin if possible.
I'll give this a try. However we have several other users running the same version with a standard account.
They aren't having the problem.
Another thing to note is he called me today and said it is working again.