Ubuntu not install on Windows 7

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http://askubuntu.com – First time on forum and using ubuntu. I checked and didnt see this issue. I downloaded and burned ubuntu 12.04 x64 on a cd , restarted computer, and booted from cd. boot went normally through all the options, connected to WiFi , chose to install ubuntu alongside windows. at beginning of installation, dvd drive opened and a message popped up saying to remove installation media, close drive and press enter. followed instructions, and computer then proceeded to boot windows with no installation taking place... what should I do? running Toshiba Satellite laptop with core2duo @2.0 Ghz 4 Gb RA (HowTos)