I need to update my windows 7 pc to windows 10, I know I can do it for free using the windows media creation tool but I heard that in order for windows 10 to recognize my windows key on my pc and migrate it to windows 10 I should not do a clean install, is this correct? After I update to windows 10 without a clean install how do I clean install windows 10, using the windows creation media tool again or doing a factory reset using the recovery partition (this should now be windows 10 after upgrading correct)?