Please post a couple of items from the burn log, which can be found at C:\Documents and Settings…username…\My Documents\DVDFab\Log\ This is a text file that you can open with Notepad and copy and paste a few recent entries into a reply post.
if you havent already, please read the official guide.
i have a video showing what settings i use. these work best for me.
im sure this is not your first dvd program you have tried using. not knowing what else you have installed, uninstall what you dont need. then follow a nice guide from stormjumper for how to uninstall / reinstall dvdfab.