A little more detail please...
What hardware?
What specific problem are you having? Are you getting an error?
You usually need to have the SATA drivers copied to a FLOPPY and press F6 as soon as you're prompted to when the XP installer starts (unless you're lucky and XP has native drivers for it).
Your old 32-bit drivers may not work. You may need to download 64-bit drivers for your controller from the manufacturer's web site, which may or may not be available yet.