i have a new monsters inc. dvd that will play fine in my dvd player but in my computer it will not play automatically. it goes thru the preveiws, selections and all that but when it gets to the movie it locks up, i've reinstalled my dvd player many times, but still the same thing. the only way it will play the movie in the computer is if i go thru scene selection a click on the first chapter. is it the dvd or my computer?