or you may want to re-rip using dvdfabdecrypter or the psl2 fille wizard and your prob's should melt away basically Nero is picky about these files one could burn the iso w/ imgburn but since you are using freeware it's probably best to process teh files or re-rip using tools mentioned above.
dvd rebuilder will not fix a bad rip in any form, as of yet.
there are a lot of AnyDVD fan's here but I personally use the psl2 wizard as dvdd little helper both use fixvts.
dvdfabdecrypter is also pulling to the front as they been fairly quick with the updates lately.
but rebuilder pro is a nice investment all the same.
That Nero error message would not happen with DVD Rebuilder Pro. I say this because DVD Rebuilder Pro has automatic ISO creation and burn with ImgBurn.