The CD that came along with the mobo will normally have a folder "AsusUpdt" in the "Software" folder. Setup the Update Program and it should do the rest.
During a problem solving conversation with an ABS tech, he suggested that I update the Bios on my ASUS K8VSE Deluxe. Sure enough there is a recent update. How is this done? Is it a "chancey" procedure best left in the hands of trained personnel?