Hmm... I just did a default installation of MDK 9.2, downloaded the new driver from Nvidia and ran the installer, and it went fine.
With your issue, though, could it be that the power cord is disconnected, so it isn't finding the correct ID for the card, and therefore can't associate it as an nvidia chip?
What is the reason for having the card unplugged?
Also, if the 4496 driver went through fine, have you tried removing it first, then going to the new driver? Sometimes that makes a difference, even if the installer is supposed to remove it for you. I have had problems with their installer in the past, with that being the cause.