try this player first for broken files, codec issues, etc.

Entree
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Joined: 21 Aug 2006
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Try this free player i found on Softpedia.
http://www.softpedia.com/get/Multimedia/Video/Video-Players/Gom-Player.shtml

It plays broken files, locked files, and comes with all codecs built-in. I used to use VLC but i think this one has much better UI.