First off I had windows 10 activated on my old asus motherboard, now I switched too a new intel one, now I cant activate because I don't have the product key u get when u upgrade from windows 8.1... Now my new issue is when I switch back too windows 8.1 I cant upgrade from there because it says my windows 8.1 key had reached its limit (or something like that) so now I'm stuck without no free product key or my old windows 8.1 key... please help.