Can't Play Any Wav Files With Player

I have a (I hope) a small problem with WMP and wav files. I've fixed a similar problem a while back but I've forgotten how :-).I can't play any wav files with my player. I get an error message that reads the following "Windows Media Player cannot play the file. The Player might not support the file type or might not support the codec that was used to compress the file."The funny thing is I can play the wav files in other players like winamp , quicktime and mplayer classic. Also read this when I try in wmp 10 "C00D1199: Cannot play the file Windows Media Player cannot play the file. You might encounter this error message for one of the following reasons: The file type is not supported by the Player. For a list of file types (formats) that are supported by Windows Media Player, see Supported file types. The file type is supported by the Player, but the file was compressed by using a codec that is not supported by the Player. "