wubi dual-boot installation of ubuntu 12.04 on Windows 7 fails to boot

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http://askubuntu.com – I am trying to use the wubi installation process to create a Ubuntu 12.04 / Windows 7 dual boot setup on my Windows 7 machine (Dell Inspiron 17R). The installation initially works fine, and I am able to load Ubuntu several times after selecting it from the boot menu. However, when I boot into Windows 7 it seems to corrupt the Ubuntu boot process, because after running Windows 7, Ubuntu won't boot on the machine. It is still listed as an option in the boot menu, but when it is selected, the machine does one of the following: -hangs at the load-screen and says that Ubuntu is preparing to run (HowTos)