First Timer struggling to install Wubi

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http://askubuntu.com – I'm trying to use Ubuntu for the first time here. Trying to install 12.04 using the wubi file (following these instructions: http://www.ubuntu.com/download/help/install-ubuntu-with-windows ), but at step 7 (the end), when I select Ubuntu the screen glitches out, shows a bunch of twitching colours, and then the screen goes to black and the computer stops responding. I don't really know what I'm doing and have no idea how to fix this so any help would be greatly appreciated! My computer is currently using Windows 7, ACPI x64-based PC, AMD Radeon HD 6670, ACER AL1916W monitor. (HowTos)