Hi kerolkid,
At this point I am running thin on ideas! I have found a document called "Windows: 'Device Setup Failed to Complete' or 'Unknown Device' Message Displays on the Computer During a USB Installation" I think you should try the suggestions in the document and hope for the best.
It is entirely possible that the computer can not see the printer because of a hardware issue. It is odd that a hardware issue would occur at the same time as you upgraded and not all that likely, but possible.
I suspect the issue is more likely related to the upgrade. A great way to test the hardware is to connect it to another computer (if you have one).