Can't read image in the timeline of windows movie maker 2

I don't understand my problem. I could import jpeg, gif,
mpeg files in movie maker 2, and make a preview of each
files. But, unfortunetly when I drag and drop an image
file (jpeg) in the movie maker timeline, and when I try
to preview my own movie, image aren't displayed, I only
see a black screen. When I add a title, or a video file
they are displayed but not image files.
Please Help me to solve my problem !
Perhaps it's a codec problem.
I don't really know.