When attempting to dual-boot Ubuntu 12.04 and Windows 7, boot loader cannot mount root.disk

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http://askubuntu.com – My PC manufacturer has already allocated all four primary disk partitions, so I attempted to install Ubuntu 12.04 alongside Windows 7 using Wubi. When I select Ubuntu from the boot menu, it drops to BusyBox shell and cannot mount the root volume, even though it is visible in the Windows file system. How do I get it to recognize its own pathnames? I am an absolute beginner in Linux command line. (HowTos)