To play most streaming media, you must decompress the compressed data before playing it. The file that decompresses the information is known as a codec. If the required codec is not available on your computer, Windows Media Player attempts to download and install it.
This error indicates that the codec did not download because your Internet security option is set on High. Although a High setting for Internet security is the safest way to browse, it is also the least functional. This level of security blocks the codec from downloading.
To lower your Internet security level to Medium, follow these steps: