Whenever i rip a dvd and play it back in powerdvd or any other program, i get artifacting (little discolored box) every 10 or so minutes...i never had this problem before....but all of a sudden i can't seem to fix it....i've even tried windows xp as well as 2000 but i still can't fix the problem..i've ripped at the slowest speed possible...but i still get problems...someone please help!