I had the same problem what you need to do is go into the driver folder on the mobo cd and find the setup folder there you will see the executable disk maker to make the floppy wich will coppy the files you need to the floppy disk(i think it does some sort of weird format to the disk wich will then be read when you install them rather than just formatting a floppy and copying the files to the disk)
this worked for me 

any way i have a question for you since we have the same mobo.
i did a fresh install of xp after i configured the raid got win xp pro installed then started installing updates mabe you will notcie this also, when you restart the system the system will hang at the windows is shutting down screen it only does it on restarts and not shutdown
i think its the promise lite controller driver for xp but im not sure if your installing xp can you let me know how you make out on restarts ??? thanx