The drivers aren't supported on early Intel Mac's if you're using 64-bit Windows, which is why you don't see the option to install them when you insert your Snow Leopard CD. If you try to navigate to the installer via Win Explorer and then start it, you'll get an error message indicating the drivers aren't supported, and they won't install. You need to use the command line method outlined above (and I think you have to run it as an administrator). I believe you can also do an EFI firmware update on your Mac, and then the driver installation routine will show up when you insert your Snow Leopard disk.