Sorry for your trouble. I think you're on the right track.
Is your burner able to burn a dvd outside of Fab?
It may be that the Patin-Couffin engine (driver) is corrupted, etc., etc.
If the previous uninstall/reinstall does not work adequately, you might try the following.
Uninstall Fab, run a decent registry cleaner such as Regseeker , free, effective and pretty darn safe as registry cleaners go. I would then uninstall your optical drive(s) in device manager - both in IDE controller (second IDE channel) and DVD/CD-ROM drives (easy to do...just a few clicks) and then let windows reinstall. Then, install Fab from a new download.
Hope this helps.
Let us know...