NS E AUDIO CODEC NOT INSTALLED

NS_E_AUDIO_CODEC_NOT_INSTALLED

I get this error when attempting to export in the Multi-Channel Windows Media Pro format.

What does it mean? And how can I install the codec?

You can install a large, sane and free set of Windows codecs from here:

http://www.codecguide.com/about_kl.htm

Maybe that will help.