Windows Movie Maker is the older version that came out with Windows XP and Vista, I think, and Windows Live Movie Maker came out with Windows 7 and Windows 8, I think.
This one goes through a lot of thing very fast so you may want to pause it and slide back to see the explanations multiple times
It is quick because it does not cover very much. It does explain the differance between Windows Live Movie Maker and the earlier version ie Windows Movie Maker
It also shows: Adding Photos, Transition effects, Adding Text and Saving the Video.
This person basicaly goes through the Ribbon menus left to right and show and explains what each one does
http://www.youtube.com/watch?v=jvsRKz2peOg
Windows Live Movie Maker Tutorial #4: Edit Videos (Trim Cut, Split)
This one quickly show how to get your videos from your camera
Rather than do what is show in this video it may be easier to record the sound with your webcam which will record the video as well, and extract the audio from the video file as shown in the next video below
This does not appear to work on the 2011 version of Windows Live Movie Maker
This guy waffles on a bit and sais what can be done but often does not show how to do it
This is the old version of Movie maker, the video was uploaded in 2006
This is the older version called Windows Movie Maker
Again this uses the older version, but the concepts can be applied to the later versions
The presenter tries to be humorous.