If i remember correctly, there is a jumper on the mobo to enable/disable SATA raid if you don't use it. If you only have ATA IDE devices attached then disable the SATA raid by moving the jumper on the mobo.
The ethernet network adapter, there are two on the delux version of the a7n8x, one is Nvidia and one is 3com. You need to turn off one or both in the bios if you don'e use it, i think it's in peripherals or some such. It'll probable be the 3com network adapter as the Nvidia one should be in the 2.45 driver package.