Installing Windows 7 with external hard drive

I'm having some huge problems. I have an .iso of Windows 7 Ultimate but my whole problem is that my macbooks dvd-rom drive crapped out on me a year ago so no burning no reading and Disc Utility wont let me restore the iso onto an external hard drive.

Does anyone have any idea what I could do to fix this? Is there a way I can put the image onto the hard drive at all?

Sorry I wasn't too clear in my post. I did find that article my only problem is I don't own a pc. Soo the steps it gives for prepping the usb are not possible because its done on a pc.