Does RH9 let you test the media before you install it? I know previous versions let you.

It sounds like you're CD-ROM is fine, because you're able to get into the install, or maybe your CD-ROM is on it's way out.

You could try either downloading from a different source or try re-burning the image. Although if you're able to test the media and it passes, then I would assume the image is ok.

If lumpys link doesn't help, then try what I suggested above.