Originally Posted by William_Wilson

Odds are the drive is SATA, in this situation, since you are using SP2, it should be a simple fix. Go to your bios: F8, delete or some other key while booting.
check that your SATA drive is labeled -0 and is set to ON. Then change the SATA operation to "Combination" which should allow the boot to find your drive. If this does not work, you will need to press F6 during your startup of setup and install your SATA drivers. They often come on floppies, so hopefully you still have them.
*If you get XP installed correctly, remember to change the SATA operation back to the default afterwards.