I have windows 7. I imported my files and succeeded to create 3 videos. But now when I want to create a new video, which contains of 5 chapters for example - it freezes at 10 or 20%, than finish and when I open the new created file it contains only 2 or 3 chapters. I tryied all that you suggested - delete Cathe folder, to reinstall workout blender, but the problem is the same. I have enough free space on the disc. Can you advise me something else I can do. Thank you in advance.