Math curriculum movie for kindergarten

This video by far was my biggest challenge. I made my addition and subtraction slides in power point and then transfered them to windows live movie maker...I don't think this is the most user friendly movie maker! I had a difficult time matching my voice to the powerpoint and controlling the volume. Also, when I tried to add music behind my voice, you couldn't hear me at all! I have tried for a few days to fix the sound problem, but have had no luck! I think I gave it my best effort and hope you enjoy it:) ~Nicole