Window's Media Player-Codec Error Argh!

I now officially hate Windows Media Player and while I don't use it, when I want to view a streamed video from the internet it won't let me. I have Windows Media Player Series 9 and the codec pack installed, but the bloody thing won't play audio! It keeps giving me an error...
"The audio codec identified by the format tag 1 is required to play this file. To determine if this codec is available to download from the Web, click Web Help."