Some help removing the "voice over" please

I have just copied a video dvd and the audio track has a “voice over” descibing the scenes as you view the dvd, I used Dvd shrink and tried taking out AC3 and 5.1 but it does not make any difference, even tried DVD Decrypter with the same result. I can’t seem to be able to remove the “voice over” has anyone else experienced this problem.