Missing codec: XVID MPEG-4 (XVID).
Windows Media Player can't play the file (or can't play either the audio or video portion of the file) because the required codec isn't installed on your PC.
For more information about the XVID codec, visit the XVID website.
For more information about codecs, see Codecs: frequently asked questions.
Use caution when installing codecs that you get from the Internet, particularly some of the free codec packs that claim to include codecs from a wide variety of companies or organizations. Incompatibilities are known to exist with some of the features in these codec packs that can cause serious playback problems in the Player and other players, lead to system damage, and make it difficult for Microsoft Support to diagnose and troubleshoot playback problems. For these reasons, we strongly discourage you from installing these codec packs, and recommend that you remove them if you have installed them and you're having problems with the Player. Install only codecs, filters, or plug-ins from trusted, authorized sources, such as the website of the official supplier. Even then, use caution: some codec suppliers offer minimal customer support. Before installing any digital media codecs, set a system restore point. You can use the restore point to return to your original system configuration, if necessary.