You just need to download the Intel Application Accelerator RAID Edition
drivers from the Dell website. Go to
http://support.dell.com and log into
your account, hover your mouse cursor over Product Support, click on
Downloads, enter your Service Tag in the right box and click the arrow next
to said box.
On the next screen, where it says to Select Your Download Category scroll
down to Serial ATA. Select Windows XP where it says to Select an Operating
System and then click Submit at the bottom. On the next screen, click on
the link Intel Application Accelerator RAID Edition and you will come to a
screen with a link to the driver and an application. Click on the driver
link.
Download the file R78496.exe on the screen you come to and use that to make
a floppy disk. When you're starting your reinstallation of Windows XP you
will place the Windows XP CD into the drive and reboot from the CD. As
soon as you see the blue screen hit the key it says to hit in order to
install third-party RAID drivers (I think it is F6 but I could be wrong).
Just follow the prompts!