Ok, I've tried all the things that you guys have suggested for other people but it doesn't work for me. I tried redownloading. That didn't work. I tried changing the Video Format with AviC (FourCC changer). That didn't work. I even checked it with the GSpot Codec Information Appliance. The GSpot informs me that the video has an invalid chunk.

Details:
While processing chunk /RIFF:AVI /LIST:movi, found bad length value 295148897 at file offset 0x000414ec