Since you are familiar to Movie Maker,I think you can try DVD Slideshow Builder,Same sort of layout as Movie Maker however a lot more powerful with video effects like Brightness contrast, Blur, Carve , Embossment, Flash,Red Green Blue,Levels,Ribbon,Old Photo,etc.Everything is laid out in an easy to follow step by step instruction.
250+ picture movie styles,custom transition and pan/zoom effects.
Edit photos and videos with built-in tools, like crop, rotate, apply effects, etc
One-click to auto-synchronize video and audio
You can get a free trial here:
http://www.ourpix.com/dvd-slide-show.html#150
Other program that will be help:
Virtual dub & AviDemux
Both are free,AviDemux is good at simple cutting-split-merge, filtering and encoding tasks.Including a variety of codecs.