Getting confused in the installation process when I get to partitioning. I want to keep Windows 7 on this machine as well. I have a 500gb hard drive but installer is only showing 12gb or so and can only partition about half of that for ubuntu. Do I need to do it manually? And if so is there a walkthrough? Thanks in advance. I'm new and anxious to get into it. I'm downloading 12.04 by the way.