|"It has more Satas so I have plenty of harddrives to reformat here"|
Not sure what you are saying here, the above statement leads one to believe that you have drives connected on the sata ports.
Or do you mean that you have sata ports unused, to which you want to add a drive?
Apart from having a formatted sata drive XP will need to have at least service pack 1 or above to recognise sata.
If you need instructions you can Google for them, here's one with install instructions, I havn't read it, so check it out and see if it helps: