YOu probably can;t get it to work because CP doesn't have the default RAID drivers for it. ie. the chipset came out AFTER XP did.
Soooo... there are a couple things you can do.
1. You can load RAID drivers for the chipset in your system va floppy disk by hitting F6 when the XP installer asks...
or
2. You can use nLite to create a custom install image for XP that has the RAID drivers
slipstreamed in like I did.
Your BIOS sees the drives and RAID on basically a hardware level but XP doesn't know how to look for it unless you give it directions. You need to find the drivers for your chipset for Windows XP. nLite is a pretty easy to use program and by customizing your own install you can set it up to even include some helpful tweaks on install and even install completely unattended. It's a HUGE timesaver if you are trying out various install setups and need to reinstall the
OS more than once.
I had similar issues with the Soundblaster X-Fi on Windows XP 64 bit which I now run. After a bit of searching I found some drivers that now work great. I am willing to bet that there are drivers for that chipset for XP... you just need to really look around.