Alright, I hope the troubleshooter took care of it. But sounds like whatever caused 1803 to fail is at it again. Can you look in the C:$Windows.~BT\Sources\Panther folder to see whether there is a log file that mentions a specific driver it doesn't like?
I think it needs to be logged into an administrator account. I would choose the one into which you normally take the Windows updates & into which you do other installations. What is the computer's primary account?