I want to make a trailer out of some AVI episodes but I don't know what program to use.I just want a free program which I can import a few episodes in it and then cut some parts of them,mix them together and replace the sound with another one which I've cut from other episodes.I'd like to make a trailer out of the movies and serials I have so I can enjoy my free time.would you please suggest me a free program which is easy to use and can provide these? Except windows movie maker?!