(I know you've been told this before, but that's why you get that message. Your computer can't boot from the cd unless you burn it properly, and burning the iso as a file won't work even if it seems reasonable.)
I'm trying this. I get a window that asks me if I want to load Windows XP or Debian Installer. If I choose Debian Installer, it says welcome to grub, and then nothing happens for a while and I get the starting screen again.
I'm going to go off of everyone else's diagnoses that the ISO is not being properly burnt. If this is indeed the case, Ubuntu has some very clear directions for burning the ISO to disc.
Sounds as if it still not booting from CD. Actually with the Ubuntu CD, the Ubuntu Live System could come up first (without you doing anything). Does that happen?
1. HD System Type-(00) Missing operating system
Crap.