LeftAlex :
I have Windows 8 and it keeps telling me to activate it but I got Windows 8 with my computer and now I have bought a Windows 10 product key and I don't know how to activate it. Can anyone help?
1. If Win 8 came with your system, why was it unactivated?
2. For the Win 10, you just need to install it.
Go here: https://www.microsoft.com/en-us/software-download/windows10/
Download that tool, create your install media, install
When it asks, input your Win 10 license.
But you didn't need to 'buy' Windows 10. If you had gotten your original Win 8 fixed, you could have Upgraded to Win 10 for free.
Where did you get the Win 8 and Win 10 licenses?