Hey everyone, I have been wanting to replace my mobo with a totally different one. But I dont know if my windows 8.1 is OEM. I got my computer pre-built from cyberpowerpc. I'am keeping the same chipset, z87. But different brands. MSi to Asus. Will I need to buy a new OEM? I have heard that windows 8.1 does not use OEM. So do I need to buy a new one? Cyberpower included a win8.1 repair disk.