I forgot to add that I've heard of the Windows system restore fixing things, but I've never had the pleasure of seeing it work.
All I ever get is either a tedious wait for the familiar sorry-it-can't-be restored or else a successful system restore that doesn't fix the boot problem.
In any case, it sounded as if Dave's IT guys tried a clean Windows 10 install and are stuck at the reinstall of AC because they need a support-key and AC isn't responding to Dave, who is understandably frustrated, particularly since other threads mention a 15-minute response.
