did you hit f6 at the start of the install to load drivers for the scsi controller card drivers/or onboard scsi device .may or may not be necessary to do so ,you will need the drivers for the device ,i know in my case i have them on a floppy ,but mines is older computer with a pci scsi device that i first need to load drivers before winxp see the scsi drive .are you sure its a scsi and not a s-ata drive ,if so same applies for bot types of drives in some cases winxp will have drivers for sata drive ,
if you have a manual of the motherboard check chapter 5, about installin an os . ,if you don't have a manual download this one for your board .your mother board should have come with a cdrom with drivers on it for the s-ata drive
http://dlsvr01.asus.com/pub/ASUS/mb/socka/nforce2/a7n8x-e/e1876_a7n8x-e_deluxe.pdf