Cannot rip fail

[bambam]

Hi
I try to rip DVD files (vob, ifo etc) into a xvid file using imtoo dvd ripper
during the process it stop and tell me the ripping has fail

When I try to read the dvd files and it skip some frames, sometimes it play fine other it display some garbage

So the DVD files are obviously really messed up
But the video is something very rare and I cannot find it again.

So my questions is: Is there any program that can "repair" these file
so I can at least watch all the content that is not corrupt

Thanx for your recommendations

[Baldrick]

Is it a commercial dvd? or home burned dvdr/w?

[bambam]

It is a dvd made by these DVD recorder machine (like a VHS to record a tv show for example)
So I guess we can consider it home made