product key

So I have Windows 10 on my old laptop and one day it just crashes. I fiddled with it for a few days and couldn't get it to work so I just wiped the hard drive. I have another copy of Windows 7 Professional and I used the disk to install the OS, however I did not want to use the product code...

Hi, I'm considering upgrading to windows 10 from 7, but I'm a bit concerned about game compatibility/performance. I noticed minecraft has a windows 10 version, why doesn't the regular version work? Anyway I'd like to know what happens to my windows product key once I upgrade. I heard it would...

I've bought and repaired a 2nd hand laptop. Everything swell apart from trying to verify genuine windows. The sticker on the base is all legible but for one group of numbers/letters. Can anyone help me decipher? or have any clues? I know win 7 keys are cheap, but it's the principle...