The board is 64 bit compatible.
Your problem is that Asus doesn't list any Windows 7 drivers for it, they do list Vista 64bit, you could try those from Asus support.
Thanks for your help. I desided to just leave things alone and see what happens. My computer runs fine, other then there are some 64 bit updates that will not install. Maybe windows 7 installed the motherboard drivers while windows 7 was installing ?
My install was to a clean harddrive.