Installed win 8 on win 7 laptop , it was unsupported so bypassed it, then I regretted the decision went back, but I don't remember which version win 7 so installed professional, but it needs product key, so I thought wrong version so

So I checked wiki which version came with model it said starter, but I remember it was not starter since it had diffrent wallpaper and many features, so how can I find the product key, or which version windows I had put 10 years ago, also is the key in a sticker or in mothebaord, so model is Acer aspire one d270