Your wish is my command. Thread title changed. It only appears on the first post, not the rest, but the new title is what will appear when people see it on the forum lists.
If the USB is recognisable in Windows and boot Wubi fine but won't boot when you install 12.04 or the others, I'd imagine it is skipping over the USB because it can't find anything bootable on the USB. How are you creating the USB installer? The problem may lie there as the machine is not seeing the USB as bootable media. Wubi is a different kettle of fish so installing Wubi vs installing Ubuntu to it's own partition from bootable media are not comparable.