Do you mean that when you browse for the drivers and open the right folder, there are aren't any files displayed (which is what Windows does if it doesn't see any driver files at that location)?
I've had that happen once or twice (even with XP with which these things are supposed to be virtually automatic!). Try going straight to the relevant file without using the Add New Hardware Wizard and double-click to run it. That might get it to install. If you are using a sofwtware CD, then that might not solve it.
Hope that helps.