Getting windows 7 to boot from external hard drive. Using Ubuntu

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http://askubuntu.com – I have Ubuntu 12.04LTS as my current operating system, and I have a Windows 7 iso on a disk. I'm using an external hard drive because my internal hard drive has become damaged. I need to get Windows to install onto my external hard drive (where Ubuntu is as well). The iso disk will not install windows to the hard drive. Can anyone help guide me through the process of getting windows on the external? (HowTos)