The files I can't open are just small videos from my camera that I want to put onto one disc for family. They are avi files and I have already downloaded the codec that I am told I would need to open these files. I did read the other comment on this exact question but I couldn't find MovieEdit.ini file to try to rename or delete it. Some of the other avi files have no problem. If I could get step by step help it would be much appreciated. I'm just starting to use my Movie edit program and am already stuck.