Vista Tutorial - Load Driver option doesn't recognize nForce drivers on CD

I need to install nForce Raid Controller drivers before I can install Vista.
I downloaded the drivers from Nvidia site, unzipped and burned them to a CD.
But at the step of the installation to pick the Drive to install Vista, I
select Load Driver option to add these drivers to complete the installation.

After I inserted the CD with the drivers, I was expecting to get a box to
select what drivers I wanted to install, but I got nothing, Vista tells me
there were no drivers on the CD to install. You can't navigate to find the
drivers on the CD.

So what am I doing wrong?

Suggestions, comments..all appreciated.

Thanks,
--
Greg