In addition to what chscag said here is how you can create the usb install drive that should work for any version of windows that you have an iso for using bootcamp:
Creating a Windows flash drive installer on an OS X computer
Note: In Mac OS X, the option to create a Windows flash drive will only appear if the computer you're using does not have an optical drive. On Macs with optical drives, the option will be either missing or grayed out.
1. From the Finder, open the Applications folder, and then Utilities.
2. Open the Boot Camp Assistant, and then click Continue. The next screen should give you a list of options.
3. It is recommended making the USB drive installer first. You don't need to install Windows or download the support software at this time, as it will be easier to do both later. To proceed:
a. Verify that the USB drive you will be writing to is plugged in and is at least 8GB.
b. Uncheck the Install Windows 7 or later version and Download the latest Windows support software from Apple options.
c. Check Create a Windows 7 or later install disk and click Continue.
4. Your USB drive should be listed in the "Destination disk" area. Use choose to browse to your .iso file; after selecting it, click Continue.
5. If prompted, confirm your action and/or provide an administrator's password. The process of writing the.iso file to the USB drive can take 20 minutes or longer.
Lisa