You either installed Morgan Stream Switcher or (worse) a codec pack such as Nimo Pack. In the first case, deinstall the switcher, in the second, deinstall the pack ( and pray for him to leave your system registry intact ), and install only the needed codecs ( ffdshow, ac3filter, oggdsf, divx3.11 alpha)
Edit : the solution given by mguarguir ( five posts down this one ) is better
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