Nero Vision 7

:sad:I am having a problem with Nero Vision which is a part of Nero 7 Premium.

About two days ago, I noticed that once I have added my files to be Vision; once the encoding has completed, the burning process begins, but I cant see the movie preview in the window as it is burning! I need to know why this has happened? Also since I cant see the movie previewing as it is burning, will the DVD come out as before or will I have a blank DVD movie with no picture and sound? How do I correct this problem? I have uninstalled and reinstalled Nero 7 about 5 or 6 times withing two days and each time I used Nero Clean Tool to uninstall it. Please help me! :sad: