Note that you can do a full clean install of windows with an upgrade version, which is cheaper than the full version. You just need to qualify as an upgrade (which is generally just owning a prior version of windows, but I'm not sure on the details). You can also buy an OEM version for less than a retail copy if you need the full version.
Installing the OS twice from an upgrade disc will fool the OS into thinking that it's a valid upgrade. There's also a registry entry that can be flipped to accomplish the same thing.
sorry I'm very inexperienced with Mac. How do I get Windows so I can download Audition. Do I need windows to get Audition? redbana.com btw.
Might as well go for the "free" internet version in this case.