AVI's play in Quicktime, but not Media Player

I am running XP with service pack 2 and MP v.10
When I try to load the avi files I downloaded from my digital camera, MediaPlayer plays back a blanc screen. The same thing happens with MovieMaker. It shows the data is there and it is a video file. Quicktime plays them, as well as the photo viewer I downloaded from Fuji, but I want to edit them with MovieMaker. The only place that it gives the file an .avi extension is in the Fuji viewer.

maybe its because your a jerk