Windows media player 11問題

本人有個問題關於Windows media player 11
當我用Windows media player播.avi果時
發現唔知點解畫面同字幕唔係同步:funk:
而且畫面慢左好多- -
睇得好辛苦.....
唔知各位師兄有冇解決方法@@?