In case my post doesn't make much sense, perhaps you didn't notice that you originally posted this in the forum discussion forum.
leapinlew's suggestion would probably not even work, but even if it worked you would be asking for trouble. Swapping motherboards should always be accompanied with a fresh install of Windows (usually you will have no choice because Windows will no longer even boot). The only time this doesn't apply is when you are swapping with the exact same make/model motherboard, in which case Windows doesn't even know there have been any changes made.