How to choose random transition for each picture when making a video with windows movie maker?

Windows Movie Maker problem, PLEASE HELP.?

• So I'm making this movie thing for a project and the MAJOR problem is the music. Yesterday, it was working fine with all my music and video/pictures. But I opened it up again today to work on it and ALL my music and even some video footage had 'x's on them, and it won't play! I can't keep taking the music off and re-adding it bc there's a specific time where it has to start and it literally took me like 3 hours to start it where I want it to at each picture and video and now it just stopped working..?? What do I do to fix this? It also lags a lot, but I figured out that if you publish it, it stops. But can you make the lag stop while making the movie bc it makes it harder to match my songs with the videos cause I don't know if the timing is correct. Do you know anything better to make a movie on? It needs to be free though! Anything out there? I really need to get this done, but this is making it impossible.

• Answer:

  Well you probably won't find anything better for free. But your music is x'd out because wmm can't find the original source of the music.