Windows 10
Windows 10
The key remains unchanged. I’m uncertain about the feasibility of a new installation.
Yes, it will work. You don’t need to worry about it being permanently on the motherboard. Just call them, and they’ll reactivate it for you without any questions.
I still run Windows 8 that came with a 500GB SSD from Craislist. The seller provided me with the key, and I've been using it nonstop since my seventh install. I haven't done a fresh setup either, so if they detect a change in the motherboard, just enter your installation ID and they'll return it easily.
Just keep it in mind, never lose your Windows keys or install a disc, but I can still open Windows 7 whenever required.