"Windows Movie Maker has stoped working"

[DDD]

i was trying to make a video for a school project, i had one video clip i
used in movie maker which is in AVI (I got vista home premium by the way)

there were parts of the video i needed playing normal & some playing in
reverse so i ran a program that a reversed copy has been made (so theres 2
videos ). after trimming most of both videos, there is only about 10 seconds
of each on the time line. I wanted to mute both videos so on the time line
section i clicked on the plus box next to the word video (on the left)

2 new rows appear which are transition & audio, a second after clicking the
plus box, a message comes up saying it has stopped working , & an option to
close comes up. THIS HAPPENS EVERY TIME, CAN SOMEONE HELP ME

 

[Graham Hughes]

There are over 800 avi file types, of which really only dv.avi works
properly.
What is your avi?
Use avicodec to find out if you don't know.
http://www.myvideoproblems.com/WebPages/UsefulProgrammes.htm
Then, if it's not dv.avi convert it to wmv.