You can try to uninstall while attached to the old mother board.
>Power the machine off.
>Unplug the machine, and hold the power button down for 30 seconds to relive and stray energy, (dont want you getting hurt now XD).
>Install the new board.
>Boot up, insert Windows 7 disk
>run repair install.
This should replace the old
drivers with the new ones needed by the new mother board.
If that doesn't work boot into safe mode and run automatic updates.
Last resort fresh install remember to backup first.