Holy cow, the driver package is a 7MB download :Q I'm going to make an assumption here, that the A8V Deluxe is somewhat similar to the K8V Deluxe. So do this:
1) throw the Asus motherboard's CD into a working system, then click Start > Find and find files named Makedisk.exe on the motherboard's CD.
2) note the folders that the different Makedisk.exe versions are located in. One of them should be named with "VIA" in its name
3) run that Makedisk.exe to make a driver floppy with the VIA drivers on it.
4) fire up the system and hit Del to get into the BIOS. The board should first run through its different disk controllers. Note whether your drive is picked up, and by which one (VIA or the other one).
5) once you're into the BIOS, go to the
Advanced section, then into the
Onboard Devices Configuration sub-section. In there, make sure
OnChip SATA BOOTROM is enabled, then escape out of the menu, save & exit.
6) now try running Windows Setup and hitting the F6 key when it says to, then feed it your new driver floppy with the VIA drivers on it, and let me know what happens

I think you will not need to enter the VIA SATA BIOS to set the drive as an array, but you might... we'll cross that bridge when we come to it if the above stuff isn't working.