Where can I find a free DVD Ripper that is capable of only ripping part of a

[savannahg2002]

DVD and in high quality? So i have been using adobe premiere pro cs3 to edit video and my original dvd that i recorded onto is clear, but when I rip it to wmv format it has interlacing problems and when I rip it to AVI format it is really unclear and has digital squares, so I don't really know what the problem is? I have been using AoA dvd ripper and the reason I need a program that is capable of ripping sections because there is a scratch on the disk i have to burn around.

Thanks