WMP + Error + Need Audio Codecs?

Go here and this is my problem.
I get a : explanation mark with red text on some of the files.

http://img256.echo.cx/img256/9927/error5dp.jpg

I tried to play the files that didnt work in VLC media player and they worked fine.

So, I think I need some codecs for WMP but I don’t know where to get them and what folder to install them too.


Thanks, Justin