Yes. It's most likely due to a missing Codec.
KC Softwares:
http://www.kcsoftwares.com/?vtb
<quote>
VideoInspector is a tools designed to provide you with as much information as possible about your video files. With VideoInspector you'll know why your video files has no sound or refuses to play correctly. VideoInspector will help you installing the required CoDecs (coder/decoder software) for an optimal performance. VideoInspector can also inspect your system to find which codecs are available, and it can also process multiple video files and export its result in HTML or plain text files.
</quote>
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Regards,
Ramesh Srinivasan, Microsoft MVP [Windows Shell/User]
Windows® Troubleshooting
http://www.winhelponline.com
Ive been downloading the free videos from Microsoft that are in .wmv format
but no audio plays in WMP 11 however, it plays the audio in VLC Media Player
and no video so how do I fix the problem?
Im gussing its to do with the codec?
Ive tried re-installing Widows Media Player