Ah! My apologies. I see that in post #3 you did mention that you had W7 Ultimate installed.
I have a feeling that is the problem as to why your upgrade to Windows 10 is not activating. You had Windows 7 Ultimate installed then upgraded to Windows 10 Pro. Ultimate and Pro are not the same Windows Editions. I do believe they have to be the same Editions.
Pro is the correct upgrade version from Ultimate as there is no Ultimate for Windows 10.
Was the copy of Win 7 Ultimate activated before upgrading to Win 10? If not then it will ask you for a key.