I have a OEM: DM windows 8(Core) key that came with my laptop. I used RWeverything to obtain the key from my bios I just finished reformatting and installing windows 8.1(N) using MS mediacreation tool. I used the generic 8.1 key for the install process, now when I try to active with my windows 8 key, I'm getting an error message saying that the key I used isn't compatible with the current version of windows that is installed. I don't have a windows 8 iso. What can I do now?