Follow these steps to create a bootable USB from Windows. Note this is similar to my post about A Multiboot USB, but mainly for on the fly single OS booting.
Insert a USB drive into the computer.
Open CMD Prompt as administrator, and type:
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diskpart list disk #get your USB drive number, usually 1 select disk 1 clean create part pri select part pri format fs=fat32 quick active exit
Now just copy and paste the system image to the root of the USB drive. It should be bootable now.