In this tutorial I’ll show you how to use Windows Movie Maker (a
highly video-editing software in Windows Vista) to edit and create
movies.
In order to create or edit a movie, you must have a video file to
work with. Let’s assume you imported 2 clips from your video camera and
you’d like to join them together and add background music and
transitions (if you don’t know to import clips from your camera to your
pc read Transferring data from a digital camera).
Open Windows Movie Maker by clicking on the Start orb - All Programs.
Click on the Import media button and select the two movie clips you want to work with.

Right click on the clip and select Add to timeline – do this for both clips.

Now that your clips are added to the timeline we can start modifying them. Note: to change the order of the clips on the timeline, left click on the clip and drag it whenever you wish.
Let’s add some background music. Click on Audio or Music in the Import Section and select an audio file.

Right click on the audio file and select "Add to timeline".

Not what the audio file is added to the timeline, we can synchronize it
with the two clips. To accomplish this, position your mouse at the
beginning/ending of the audio file (2 red arrows should appear) and
drag it to the desired position.

Next, let’s add a transition. Transitions make the passing from one
clip to another look more aesthetic and professional. Click on the Transitions button, select a transition and preview it.

Once you find a transition that you like, left-click on it and drag it
on the last clip in the timeline. You should end up with something
similar in the picture bellow.

Besides adding a background sound and a transition, you can take this
further and add Narrations, Credits and titles and other cool effects
to your movie.
The last step in creating the movie is actually publishing the movie. Click on the Publish Movie button, select where you want to publish it and…you’re done!
Note: For more Windows Vista Tips, Tricks & Tweaks.