To clarify burning to disk, in your burning software, did you choose the "burn Image" option? Not just burning the iso file to the cd.
What burning software package are you using?
Do you see the iso file on the cd when you look at it, or a list of many files/directories?
Also, you need to burn the image on a good quality cdr or cdrw, at 4X or 8X, not the top speed rated for the cdrw drive.