I have an SSD with a Windows 10 installation on it. This Windows 10 is and upgrade from Windows 8.1 which was an upgrade from Windows 8. I still have the Windows 8 key and installation media. What I'm doing is building a new computer, but my hard drive is still new, so I want to keep it. When I put it in the new system I plan on doing a refresh or clean install, so that everything is nice and clean. But, I don't have a product key for Windows 10. Is my only option to use my Windows 8 CD then upgrade to 10? Is there a way to retain my 10 installation then reset it? This one hurts my brain. What I think would be best is right before I move the hard drive is do the reset, then move it to the new computer, but then I don't know how windows will active since I can't use the 8 key and it can't do a internet activation based on hardware because all the hardware is new.