You likely need the RAID drivers for XP to properly identify your RAID controller.
XP setup will prompt you for the driver on floppy, "Press F6 to install RAID drivers".
Heres a great tutorial on how to make a XP install CD that includes the drivers you will need for your board.
Beginners Guides: Unattended Windows 2000/XP Installations - PCSTATS.com

On a related note, here's a link to make an offline update CD for Microsoft products. It downloads all the updates and makes an ISO ready to be burned to CD/DVD. It's much, much faster than downloading them from within IE too.
http://www.heise.de/ct/projekte/offl...nload_uk.shtml