What I did was a fresh install of Win7, but with automatic updates turned off so that it would be using only the basic Microsoft drivers for everything. Then I went into the device manager and uninstalled the unknown device (my odd OEM-specific older nVidia hybrid graphics), and then upgraded to Win10 via a USB install media.
It's kind of dumb that I had to do this. Since they're handing out upgrades like candy, I should have been able to just go to a website, give MS my Win7 key and just be handed a Win10 key I could use to do a fresh install. Better yet they could have just made all the old valid Win7 and Win8 keys also valid Win10 keys. I'm sure that would have been technologically possible.