Shouldn't have a problem. Windows should pick up the new devices, and install the drivers for them ... if Windows can't install the drivers, the board should come with a disk or CD that will have the chipset drivers and such to use.
Of course, this is a best case scenerio. When swapping out major components like the motherboard/processor, there's always a chance you'll have to reinstall the OS. So as a precaution, I'd go ahead and back everything up, just incase.
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