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To play most streaming media, the data must be decompressed before it can be played. The software that decompresses the data is known as a codec. If the required codec is not installed on your computer, Windows Media Player attempts to download and install it.
This error message indicates that the codec was downloaded, but it failed to install automatically. Typically, you are prompted to restart your computer after the download, but the prompt may have failed. To complete the codec installation, restart your computer, and then try to play the file again.