That's pretty much the question my computer wizard stepson asks me whenever I have a 'puter problem and I'll be damned if it doesn't solve just about every one I have.
It sounds like what you need is a slideshow program that allows you to include audio.
There are many available.
Do a Google search on free slideshow maker or software.
NEVAR use movieMaker —it’s the worst program in the world.
Use the free version of Sony Vegas.
Way, waaaay, waaaaaay better.
Never crashes, much better features, etc. etc.
As one who downloads songs from the Internet onto cassettes, I will be eagerly awaiting answers to your question, since I would like to become more adept at producing digital media.
To download and use, Apple Quicktime Pro is only 30 bucks.
If you need to edit your audio before importing it into your movie, Audacity is a top knotch open source (free) audio editor. If your movie maker program doesn't like the audio format, open the audio file in Audacity and export it in a usable format.