Windows Media Player cannot play the file because there is a problem with your sound device. There may not be a sound device installed on your computer, it may be in use by another program, or it may not be functioning properly
Please go to http://www.free-codecs.com/download_soft.php?d=5883&s=7... and download Download [ K-Lite Codec Pack 6.2.0 FULL ]. This will give you the ablilty to play most codecs. I use the media player classic that comes with the download, but Windows Media Player will use those codecs to play other files too.