Okay, so there's internet connectivity issues, display driver issues, and Win10 is really dumbed down for the masses. Doesn't look like I can assign program priority and switch cores on and off anymore.
Because I access internet with a USB device, that's easily fixed by a reinstall. I think I can fix my display issues with new drivers, as well. Still, it feels a bit unpolished. Also, it has a "designed for tablets" kind of feel to it.
Terragen works. Modeller works, though is slow, but I think that's because my graphic card isn't working yet.