so it seems the problem is not with dvdfab ripping. the original dvd plays the same as the rip when viewing in VLC player. have you tried other source dvds or just this one? could be scratched/dirty dvd?
do you know how to uninstall and reinstall device drivers for your video card? what make and model of computer do you have or did you build it?
you probably have Vista, 2GB ram is considered minimum by most users, do you have alot of processes running? did you install any codec packs? did you install any other dvd burning/ripping/authoring software? what dvd drive make and model do you have?
and any other information you can think of which may pertain to dvd ripping/viewing.