[64 bit] Installation Type Option

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http://ubuntuforums.org – On a new Asus X54C WIN7 laptop I am trying to install 12.10 desktop 64 bit. In the documentation ( http://www.ubuntu.com/download/help/...desktop-latest ) step 4 'Allocate drive space' (installation type box) the first option is 'Install Ubuntu alongside Windows 7'. The actual installation type box that the installer presents me has 4 options: 1) 'Erase disk and install Ubuntu', 2) 'Encrypt the new Ubuntu installation ...', 3) 'Use LVM with the new Ubuntu installation;, and 4) 'Something else'. What have I done wrong that makes me miss the 'Install Ubuntu alongside Windows 7' option?? G (Hardware)