I'm almost "positive", Win 7 was the problem. Apparently, you can't even get limited Rift functions to work on Win 7, I've recently read about some Rift S owners that DO run it on Win 7, but not all Rift menu selections are available. At least they got theirs to run. Oh well, like I said, I have no choice now. I might install 10 a bit later. I'm in no hurry at all, for another run with Win 10 and it's gaming issues.