If you plan on using the same Installation of the Operating system. you'll need to remove all the drivers for the current motherboard.
Then Run a repair install on the installation and probably re-activate Windows. Too much hardware change for it to even consider booting on its own.
I however recommend, if you are going to do that massive overhaul, to backup any important documents and just format and re-install a clean Operating system. That way you are sure to have a lot less problems than trying to port an existing installation to new hardware.
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Ignorance is not necessarily Bliss, case in point:
Unknown has caused an Unknown Error on Unknown and must be shutdown to prevent damage to Unknown.