Windows Media Player cannot play the file. You might encounter this error message for one of the following reasons:
Typically, the Player automatically downloads and installs required codecs as needed. However, the Player was unable to download and install the required codec for this file, most likely because a codec is not available for the content that you want to play, or because the Internet security settings for your browser are set too high and do not allow you to download the codec.
Try adjusting your Internet security settings to allow codecs to be downloaded to your computer.
The security level is set to Medium.
For more information about setting Internet security levels, see Windows Help.
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