I've got a similar setup (Asus P4P800 mobo, same chipset; and a WD Raptor SATA harddisk). I did not have to use any SATA driver at all. The SATA driver is usually reserved for "external" SATA mobo configurations (PCI cards and such), if I'm not mistaken...
Perhaps your bios isn't set up properly? Or the harddisk/mobo combo isn't working out. It is even possible one of the components is defective.
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