If you are loading Windows XP onto a computer with a serial ATA (SATA) hard drive, you will have to manually load the SATA drivers.
Hopefully you have the SATA drivers available on a floppy...
Then, boot system by Windows XP installation CD, when the message "Press F6 if you need to install a third party SCSI or RAID driver" shows up, press "F6". Then, press "S" to specify additional device when next screen pops up. Put the driver floppy disk in and press enter to continue. You will then be asked to select the driver. Then select "VIA Serial ATA RAID Controller(Windows XP)".) After the SATA driver loads and Windows XP can recognize the SATA HDD, you can continue to install Windows XP as usual.