Clean install of Windows XP Media Centre Edition

I have  a Dimension 9150 running Windows XP Media Edition.  When I bought it in December 2005 the configuration was 500 GB Serial ATA Raid O Stripe (2 x 250 GB 7200 RPM Sata Hard Drive).  After having many problems with blue screens etc, a Dell agent came out to help with the problems, which they weren't sure were hardware or software. Finally a technician reinstalled XP at my home and all seemed well. Most things seemed to work alright (my card reader didn't, although I didn't realize this at first). However, not being very computer savvy I hadn't really understood that the set up was now non-raid but was aware it was slower. However, time has passed and I have now had other unrelated problems and decided to do a clean install of Windows XP myself which I thought would be relatively straightforward. At the same time restoring it to Raid configuration. Boy, have I got in a pickle. I have backed up all my data. I have enabled Raid in the BIOS but when I click F6 to install a third party SCSI or RAID driver, I don't have a diskette. I don't know for sure which I need, although I think it is Intel (R) 82801FR Sata Raid Controller but can't find the download for this to put on a floppy disk. I have the Dell Resource CD but don't know if it is on this or not and really don't know how to proceed.