Let me see if I can understand what's happening here. First of all, you didn't have the windows operating system disks to load so you used a disk from another build? If this is the case, it probably won't work.
There are cases where you can use another disk or even use the same HDD when changing hardware in a machine and it will work. Most cases however, you cannot simply swap HDDs or use the same HDD with different hardware without reloading the operating system.
I don't know, maybe I read it wrong. Doesn't help i'm hungover this morning either.