I bought an OEM windows and it was a one time install. I had to reenstall windows a while back and the key didn't work. Bought a key off the net and it worked for about 6 months then I got the dreaded Activation windows popping up.. I have been living with it ever since . What should I do, and what version of windows or another key or the New windows 10, and how can I install an update version if my copy is not activated? thoughts?