im having DVDs in NTSC system which i would like to edit, for some reason when im trying to capture in premiere i get twisted picture with two black lines going from left to right!, i've changed the project setting to ntsc of course but i still dont c any video properlly, does anyone knows what can i do?

When you extract video from a DVD that's not called capturing, but ripping, and you can't do it in Premiere. You need something like DVD-Rip or XMPEG and your resulting files will most probably be in MPEG-2 format instead of AVI, which will give you headaches in the editing stage.
Still, do what you gotta do to do what you wanna do!