How to install Ubuntu alongside Windows 7?

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http://askubuntu.com – I want to install Ubuntu alongside windows. So I downloaded the .iso file, made a bootable USB drive and started the installation. But when I have to choose how I want to install it, it shows: Install Ubuntu INSIDE Windows 7 Replace Windows 7 with Ubuntu and Something else And when I choose to install it inside Windows and click the button continue, my PC just restarts and opens Windows. So what am I doing wrong? (HowTos)