I has to be a codec problem. Make sure they’re all installed and it should fix the probs. Also try using a different player to view the movies. This often helps 
Good morning ,
I have a problem with playing some movies. I can play some of the movies ( avi files) with no problem, but with other movies also a avi file, I have a codec problem.
When I try to run the movie I get a green screen on my player, and the picture I get on my player is very slow, sometime the picture is running but the sound is slower than the picture. Sometime the picture stand still ( not running) and the sound of the movies is running.
Can someone help me with this problem.
You have my mail: tradeyell@hotmail.com
From Amsterdam, the Netherlands.