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There are a few programs out there that'll tell you the codecs video/audio files expect. I've never used any of them though. I use VLC media player for playing stuff generally as it'll play pretty much anything you throw at it. If you felt like installing that you can play the video file and then select View -> Stream and Media Info - > Advanced Information and that tells you the codecs in use by each stream.
Thats assuming of course your problem is codec related at all, seems likely but could be something else too.
Do you have to use AVI? could try WMV or maybe MOV.