I don't know if I should mention the site due to reviews and possibly forums, but I have a free converter which will convert the mpeg-4 files to mp3, wma, wav, that kind of thing.
Forum link removed.
Anyhow, it had good reviews, no spyware, and has been working perfectly for me.
You also get a CD ripper and audio cutter with the download, but I believe the ripper was only a thirty day trial, and since Windows Media can already rip disks, you probably won't need it. I believe you can chose not to install the ripper and cutter during installation.
Just a warning, you will probably get an internet toolbar with the program, which is rather annoying. It can be removed by unistalling the file in your Add/Remove Programs controls.
Edit: Whoops, sorry about that link. :blush: My bad.
-Ax-