in my family i am the computer person and my step father asked me to edit some self recorded video for a presentation. he gave me the cd with the video on it but when i play it, it is really glitchy. first the video glitches and freezes then the audio sounds like it is playing only every couple of frames. what could be causing this. also, don't laugh but i'm only using Windows Movie Maker. so far from what i've seen i can't fix it with that program. please, any help would be much appreciated. thanks.