Install Windows 7 & Run on Windows 8 Pro with Hyper-v on a virtual machine
If I have to learn ... why not teach you too series. One of the great things with windows 8 is its ability to run multiple operating systems on your same computer at the same time. Hyper-v is a free application on windows 8 pro and windows 8 enterprise.
This shows how to install windows 7 and get it running on your windows 8 pc at the same time.