Load 3rd part app from C: with vb6 (1 Viewer)

Hi

I have vb6. I am trying to build an Installer Console.
You know, the ones you get with, say a new printer.
You insert the cd and the Installer Console pops up and asks if you want to install all kinds of other stuff that you don't want.

I want my Installer Console to work like this....
1. Insert my cd, and I have a .inf file launch the Installer Console.
2. Click a button on the Installer Console.
3. The code behind the button will find what drive the cd is in,
and then launch an .exe file from the cd. That installs a program on the users computer.

I need help with the code behind the button.
How do I reference a file?
How do I find what drive the cd is in?

Thanks
Tom