You can't add sound to images in that sense, an image file is an image file and a sound file is a sound file. If you want to combine the two you need another format.
Do you have Microsoft Powerpoint (presentation package)? You can arrange images in that and play sounds as well.
Have you tried Picasa? It is a great free program from Google for arranging and editing your photos. It has a slideshow feature which I understand can also be used to add music.