I upgraded my OEM copy of 8.1 Pro to Windows 10 and now I need to replace my motherboard. I was running a Z87 board but I can actually get a Z97 replacement board cheaper. I'm wondering if I'll be able to keep using my copy of Windows 10 or will it not activate? I'm used to calling the phone support when I upgrade parts but I'm afraid this will be different since there is no product key with these windows 10 upgrades. Has anyone done any upgrades since getting Windows 10?