Fixing menus is a dead end street. There are a couple of programs out there that claim to do it, but they are weak, oftentimes crippled or buggy.
What you want to do is rip the video and audio off the DVD, then use a DVD authoring program to remux the video and audio, create menus, and output a new VIDEO_TS folder with your new DVD in there.
Rip DVD to hard drive: DVD Decrypter
Author DVD on comp: TMPGEnc DVD Author (TDA), or Adobe Encore, or ULead.
Authoring software isn't free, but TDA is very easy to use, does a great job, and has a trial period of a month (or was it 14 days).
DVD Decrypter is free and well respected. There are plenty of tutorials out there to help you use this. You have to click about 15 things to demux the
DVD into video and audio files. It's moderately difficult. You're trying to make m2v and mpa files. The video and audio is in those.
Both of those programs, DVDDecrypter and TDA, don't hurt the video or audio in any way, because they don't re-encode them in this situation.
Good luck, nibs
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