Comment 1 for bug 1014396

I mentioned this in the release notes - you need a vorbis codec in the form of a direct show filter installed in the system. It's not provided by Microsoft with Windows. It's not uncommon nowadays to use Windows without any additional codecs installed if you use MPlayer or VLC to play multimedia files.

Please install some kind of codec pack or just the vorbis direct show codec from http://www.xiph.org/downloads/ and try again.