It's XP Pro and it does it with the orginals and the computer is fine and the disks are fine. It's funny but I had it happen on the PC before this one but not as often it also had XP Pro but different brand DVD and DVD Burner. I know have the DVD's open to Win DVD 4 and that seems to help, it pauses like it is going to lock up and then Win DVD starts up and away it goes.