Need to know why my media player plays well, but for some time now when I download a song I can't hear it!? It tells me that an audio file is missing. All other songs in my computer play well, except those.
It is very likely possible that you are missing an important codec. The fact that you can play the same files in other players, demonstrates that Windows Media Player needs additional codecs in order to play the files. Try to install Combined Community Codec Pack then play the files again.