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From the limited information your posted I would guess your problem is WinXP can't natively configure SATA hard drives. You need to supply the SATA controller drivers. Either at the very beginning of the XP installation by way of a floppy disk or by slipstreaming the drivers into the files on your WinXP CD. You can use nliteos to perform the slipstream. Get nliteos at the link below. Get the SATA drivers from the laptop manufacturer's site.
You can also slipstream SP3 at the same time.