Installing Windows 7 on MBP from USB key?

Hello all,
I've searched all around the internet, but I just can't seem to find a straight answer to this question:
Is it possible to install Windows 7 on an MBP with a USB key? Before you answer, read my process to see where I'm having trouble.
I want to install the Windows 7 beta on my MBP, but DVD media isn't available to me. I do, however, have a 4gb USB key. I've formatted the key with my XP install (through Parallels) to be bootable, and loaded the Windows 7 install on it. When I tried to use Boot Camp, the assistant asked me for a CD/DVD, so I figured that option is out.
My next attempt was to install rEFIx, which did show the USB key as a viable boot option, and even let me select the efi file to boot the Windows 7 installer. However, when I try to load it, I get a complaint:
Starting legacy loader
Using load options 'USB'
Error: Not Found returned from legacy loader
The firmware refused to boot from the selected volume. Note that external hard drives are not well-supported by Apple's firmware for legacy OS booting.
So now I am stuck. Can anyone offer me any advice regarding this matter? Any help at all would be greatly appreciated.

Windows normally cannot be installed nor boot from a USB or any external drive. This is a Windows problem. There are methods for installing and booting Windows from USB devices, but you will need to do some searching to find sites that detail the process. It's not likely you'll find much on Windows 7 because it's beta software, and not supported for installation on a Mac.

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