Hello, Sorry if this has been asked and answered but I have a lingering question about running Windows 8.1 and Windows 10 tech preview dual boot. First of all, Windows 8.1 here is an HP OEM. I would like to keep 8.1 as is and upgrade Windows 10 tech preview to the official release when it becomes available. Will this be possible? or will windows' 10 activation change my product key in BIOS and deactivate 8.1? or something else? Thanks for helping me clarify what seems to be a grey area for me.