Okay... hang-on... ... ...
I'm on my XP 'netbook just-now, but it's pretty-much the same for Vista etc.
Simply... when in 'Movie Maker' look for an option that says 'Import pictures' when you open a file, click on ONE picture, then press the CTRL buttom, and at the same time, click on all the other pics you want to add.
Click on 'Import'
Then do the same but 'IMPORT VIDEO' or 'SOUND OR MUSIC'
When you have them, drag the sound or video down into the big area at the bottom.
That's the basics, but you can add pictures to match the right time/sound too. Click on where the picture is on the bar at the bottom, and resize it according to the length of time you wish it to be shown.
Remember, the width of the image in the banner means 'time' so if you play, say for example the words "...Put your hand up in the air, put your hands up in the air, put yours in the air and dance to the beat..." use the start and pause to to figure where to put images or videos to go with the mew sick!