driver load option recognize nforce drivers cd

I need to load RAID controller drivers on my Dell XPS before the Vista installation can continue. I downloaded the drivers from Nvidia, unzipped them and burned them to a CD. I took custom install, and when it came to the step to select the drive where I want to load Vista, I inserted the CD with the drivers and clicked the Load Drive option.
It didn't recognize any drivers on the CD. I was expecting a box to come up and select Raid Class Controller. I can't navigate to the directories on the CD either.
Any thoughts or suggestions on this problem? -- Greg