Scratch

I posted this here because for the past 2 days, I have trIed to render a minecraft video of mine but it keeps failing. Whenever it is 60% rendered, Movie Maker AND Camstasia Studio produce an error message: "Camstasia Studio has encountered a problem and needs to close." Is there a problem with the video file?
It is a 1.6GB avi file. I've tried to convert it, but that program failed too.