Just looked up your HDD. It is not IDE. You will need to incorporate Sata driver into your Setup by either using the F6 (3.5 Floppy) or Slipstream ISO method (if you can find the drivers). You might get lucky and find them incorporated in the "Intel(R) Chipset Software Installation Utility 5.0.2.1003" on this site.
www.asus.com
Most MB manufacturers have separate Sata/Raid drivers though.
Without the Sata drivers, you'll never be able to Setup XP on that HDD. (directly)
P4P800S-X - Support
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Most MB manufacturers have separate Sata/Raid drivers though.
Without the Sata drivers, you'll never be able to Setup XP on that HDD. (directly)