Download page for your motherboard:
http://support.asus.com/download/dow...l=A8V%20Deluxe
Download this SATA diver:
378ata_100104528.zip
Unzip the file, run "MakeDisk" to create a floppy.
During XP installation - press F6 when asked if you want to load a SATA driver - insert the floppy.