Various DVD movie backups read and copy fine. But when you watch them, about 1 hour to 1.5 hours in it starts to jump and freeze. Doesn't do it on every one, but 8 of 10 did in some way, most to the point you just can't watch anymore. I've tried different drives, even bought a new one. Tried different DVD-Rs from different manfacturers. Have latest Clone DVD and Any DVD. Didn't have this issue with XP. What do you think?