TSF Team, Emeritus
Have you gone into BIOS and set the first boot device as CD ROM? What are you using to install XP From? . . an original installation cd?
While you are in BIOS, check the "Sata Operation" setting, change it to "Raid Autodetect/ATA if it is not already. Now try to install XP ( Verbage will vary by manufacturer some will say IDE instead of ATA)