You can patch the .ifo using IFO Edit.
or use DVD2ONE
to extract the main movie (no menu or special features, but chapters are intact).
IFO edit is a free tool.
DVD2ONE is not.
Or try DVDSHRINK
to shrink the movie.
Or you can completely re-author the movie using Nero Recode.
Personally, I use DVD Decryptor to rip the whole DVD into an .ISO file.
Mount the ISO into a virtual drive.
Run DVD2ONE to extract only the main movie into a folder.
Burn it with Nero 6.
DVD2ONE makes a compliant file for Nero.
Works every time.
Takes about 40 minutes from start to finish.
DVD2ONE can also shrink the whole DVD to fit onto 1 disc.
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