I burnt Ubuntu to a cd, and when I went to install it, it asked me to remove the cd and press enter. Then it booted into windows

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http://askubuntu.com – As you can see by the very long title, that's exactly what happened. After I proceeded to install Ubuntu (12.04 LTS) to my computer, making it run alongside Windows 7, I got a black screen asking me to remove the cd, close the disk tray, and press enter. Now I m back in Windows. Any help? (HowTos)