hey i have been using DVD shrink and DVD decrypter together to produce a DVD but when it finished burning it leaves a swirl midway through the disc and when you watch the actual movie all it does is skip and stops...I have been using RITEK dvds and in the last batch that i brought i had no problem but just for the last week i have had problems?? how do i prevent this? is it the burner? the dvd's? or the programs i dont know i am pretty new to all of this aswell!!! HELP!!!