Blender Video Editor plays videos to fast

He there blenderheads,

I want to use blender 2.5 for video editing, but when I import a .avi video, the video is being played 2x faster. Sound seems to be ok, but the video is at least 2 times faster. How can I turn the video speed to the normal speed. I know I can play with the graphic editor for speed, but that´s not what I wanted. I want import, edit, play and render. Hope someone can help me.