First go to ASUS' website
and download the latest BIOS (804). Save it someplace convenient like the desktop or My Documents and be sure to unzip it. Open up the ASUS updater, assuming you have it installed, and in the dropdown list select "update BIOS from file" or something similar. When it asks for the file, send it to the unzipped file. It will bring up a window with your current BIOS and the new BIOS compared and you select "flash BIOS" or similar. You will have to reboot. Upon reboot, you will need to setup your BIOS again because it should now be at default settings.