This Key didn’t work. Please check it and try again, or try a different key Windows 8
When I was trying to activate Windows 8, it showed an error saying “This product key didn’t work. Please check it and try again”,
I had to call Microsoft for this issue, I suggest you do the same. I recorded what they did to show it to you guys.
I don’t recommend you trying to change the registry on your own for you have 90 days warranty on your Windows 8, so take advantage of it.