Okay so I started downloading movies a few months ago and started watching them on Windows Media Player.
When I first tried watching them a few months ago I had to get a codec for WMP which would give me a picture aswel as sound. After I did that the movies worked fine.
But now all of a sudden it's not working again and I'm only getting the sound. But before I play the movie it still says I have the codec.

I'm very confused and wondered if anyone could help or make sense of what I mean if they've had the same trouble and could give any advice.