Sound lik if you messed up with the video codecs; this usually happen, sametime when installing big pack codecs (so need to unistall and replace), or the game is not compatible with ffdshow (so put the exe game name in the exclude list of ffdshow), or <a lot of other issues with codecs>.
Most of the times the two solutions i gave solve the problem, sametime ffdshow is required but same tweaks are necessary like change the deoder of a specific format;
also right codecs but additional ds filters can cause problems, or hardware acceleration with ol cards and old drivers.
Sametime you need to search the net for hints on how to diagnose the problem, since many defective combinations are possible and many of those may need a different approachs.