Just posting this for the info of anyone who gets stuck like I just did, & does a search on these forums.
If you're installing Windows XP (Pro in my case) use the SATA drivers from the motherboard CD, copied to floppy, - not ones downloaded from the ASUS site (at least, not initially).
I tried downloaded the latest SATA drivers for the A7N8X Deluxe, & Windows would not install ... went ok until it restarted as part of the process, but then gave me error -
"Stop: 0x0000007B (0XF7C4A640, 0XC000034, 0X00000000, 0X00000000)"
The SATA files from the m/board CD worked fine.