Without furter info is hard to tell whats the problem
Install FFDSHOW, there you can fix thoses on "Picture Properties"
but since you cannot adjust the brightness
But you must check that ffdshow will be your decoder in your player.
in MPC, all you have to do, is UNCHECK, the filter for the video inside Options > Internal Filters
That way it will use an external filter, and FFDSHOW will come into play..
Sorry can't help with the sound, but at least can help you view the movie^^
"Chile is a thin and tall country"