You most likely have more experience with video editing than I do, but I have an upcoming project and I have been trying to brush up on creating videos so bare with me.
See: Creating Playable Music, Picture, Video Disks of Family Reunion.
If you would have any suggestions, I would appreciate letting me know.
From what I have been reading, ever since Windows Movie Maker (WMM) upgraded to the latest and greatest, the capability to save as an .avi file has been removed and unless you can find an original version of WMM it can not be done anymore and you have to save as a .wmv, then use a video converter to save as .avi .
Here is a dated (2010) YT video. At 0:45 it shows how to select a different file format (.avi):
If you would like to try the older version it is still available, see the link in this thread: How to get back the old Movie maker in Windows 7
There are even some comments from one of our esteemed members whs
at posts #3, and #6.
Hmm, it seems "The windows club" site has truncated whs's link in his post #6, but its here: Windows Movie Maker 6.0 - Install on Windows 7
Jim, at that tutorial you will also need the Vista files. whs posted a link to his at filefactory here: Windows Movie Maker 6.0 - Install on Windows 7
You have to jump through some hoops to start the free download, but once started I was able to grab the 71.0MB file in five minutes on my fios I have them in case I need them.
Further on down you may not need them see: Windows Movie Maker 6.0 - Install on Windows 7
End of Edit...
I have been using this search: Search&sitesearch www.windowsmoviemakers
as a guide to help you and for me in case I have conversion requirements.
I saw a post here by considerate guy
(6th one down): Movie Maker Forums
That suggested this was a good converter: Free Video Converter | MP3 MP4 AVI 3GP MKV DVD | FREE Download
and I think I am going to try it out.