I had Windows 10 installed and everything seemed fine (My Key is embedded in the BIOS), I just finished installing 8.1 again instead and it wasn't activating, it said the key was activated on another PC (which makes no sense as I literally was using 10 without issue less than a half hour earlier. It stated something like I was over the activation limit for this key or something. I called MS and got it activated but I thought embedded keys had unlimited activations. Any ideas?