I too use Windows Movie Maker. they only take certain formats. i downloaded Any Video Converter so i can use the wmv format which works best. the wav format is the best for audio. You can download audio converters for free as well to get that format. It's actually relatively easy once you get past that. if you would like to see my amvs using windows movie maker, you can look at mine on youtube. type in synngeo333 in the search bar. hope this helps. If you need any more help, msg me and i can walk you through it.