hang-the-9 :
You can't re-use the same license code from the old computer, OEM keys are licensed only for the original setup not for transferring to another computer.
True it's not intended to be used on another pc/motherboard, but you CAN use the key though... it's just not completely legal, but there are different loopholes, and microsoft themselves are not consistently clear on this. Also, this has worked without any prompt or warning or anything since windows XP. If microsoft was serious about this limitation, they would have done more (or rather SOMETHING) to prevent it the last 20 years. You can even buy OEM keys from all kinds of internet shops.
I've done this method since windows XP, on many many pc's, and i just recently found out it's not exactly legal, because in the old days, you'd just use the sticker on your old pc, so my thought was that of course it was legal. I never heard back from microsoft, and i probably registered 30+ pc's via telephone...
Anyway...
You should enable UEFI for your system SSD in your bios BEFORE installing windows.
What happens when you choose to boot from the DVD?
When you reach as far as to entering the key, it will probably fail (note: NOT rejecting), and ask you to register manually. You could then give the microsoft answering machine a call and let that work you through the process. It never failed on me.
hang-the-9 :
If it does not boot, I have seen Windows 10 activate with a Windows 7 code several times, try that.
wow thx, will try that. It couldve saved me alot of time upgrading freshly installed windows 7/8 machines