Problem solved!
I followed some instructions on the MS support site. I run the Hardware Troubleshooter and it found that the system was not accepting new drivers! I have no idea how this happened or why. The troubleshooter fixed the setting and after a reboot the drive is in File Explorer in all its 960GB glory.
To get to the hardware troubleshooter, click the Windows button, search for troubleshooter, and in the first window with a few of them click the All on the left and the full list of the available troubleshooters will show up.
I hope that helps. Thank you all for your suggestions.
