[ubuntu] Problem trying to install Ubuntu 12.04

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http://ubuntuforums.org – Please help! I am trying to install Ubuntu 12.04 in my new Acer netbook. The problem is when I come to the window where I have to choose the installation type, I have only 2 options: 1) Erase disk and install Ubuntu 2) Something else I do not have the option to install alongside Windows. Please see the picture attached. I do want to install Ubuntu but I want to keep Windows for while. Thank you for your help. Attached Images Screenshot from 2012-12-09 18:34:03.jpg (41.9 KB) (Hardware)