I have an avi file, but it only plays the sound. How do I get it to play the video also?
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Sounds like you are missing some codecs.
The video and sound codecs can be two different things on some video formats.

What player are you using?
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Definitely sounds like missing codecs. Most likely either DivX or XVid. Rather than messing around trying to install the correct ones, just download VLC Media Player http://www.videolan.org/ and play the video using that as it plays pretty much anything out of the box.
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Its all good, found missing codecs, so now plays in Windows Media Player
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