Why isn't my Ubuntu 12.10 DVD able to install the OS?

view story

http://askubuntu.com – It just gets stuck on the first screen (the one that tells me if there is enough disc space, if the power is on, and if there is Internet connection), and doesn't go forward (if it doesn't get stuck on that screen, it freezes on the next one, the one to choose an AP). The computer is a Compaq Presario C700 with ubuntu 12.04 LTS installed. The DVD loads fine and even the Live Ubuntu 12.10 loads with no problem. Note: The system doesn't freeze, it just stays "loading" for hours. (HowTos)