U download the program above and install it. This version of the program contains no spyware and is absolutly free. Then after your done go to the codec page and down load one of the MP4 aac codecs. Intall the codec. Now when your done you can click the DMC music converter Icon of the program and selct the file you want to convert to mp3, wav, wmv etc. Or convert anything into MP4...All you need is the plugins.
This program requires some work from you to configure, and figure out how to use it. This is not one of those out of the box programs that do exactly what you want with no work from you good luck