Thanks for all the responses. I just started the go back to windows 7 process. It said its only available for a month after you upgrade so I'm glad it acted up sooner rather than later.
That only applies to the upgrade system, right? I assume you should still be able to do a clean reformat and re-install Win 7 and your key should still work?
Anyway, I'm not touching Win 10 until they get rid of automatic updates not being preventable.