Several years ago I assembled a computer for my parents from some of my retired parts. It was a Q6600 and 680i motherboard if that tells you anything. Installed a fresh legit copy of Windows 7 Home oem and it did everything they needed for quite a few years. That is until about a month ago. 3-4 weeks ago - Caught in Windows 10 "forced" upgrade. The finally told me about it a week later and I figured out how to roll it back for them. My first time even looking at 10, and wasn't impressed. 2 Weeks ago - Back on Windows 7 and motherboard died. Rebuilt with a Core I3-4370 and ASRock H97M motherboard. Windows 7 installation migrated to new components and remained activated. From what I'm reading, it sounds like the Windows 7 key was used to activate the previous Windows 10 upgrade. Since that windows 10 activation is tied to the previous system hardware, I thinking it killed using the existing 7 key for upgrading again. Am I right, or will I still be able to do the free upgrade again with the new hardware? If not I know how to get around it, but I'd prefer to keep everything legit since it's not my personal computer. I'm not a big fan of Windows 10, but prior to MS pulling the sneaky upgrade campaign I would have purchased the new OS when I got ready to build a new system (maybe). It doesn't make much sense, but now I want to get it for free out of spite. I want to activate the upgrade for all computers I own or have maintain (family), but I don't actually want to use it on any of them yet. Planning to claim/activate free 10 upgrades for them and dual boot with 7, with the latter being default. I'll play around with 10 a while, figure out how to tweak it to my liking, then ease my folks into the new operating system before just dumping it on them.