For three years now, I've tried various players and none has come even close to functioning properly, other than WinDVD. Why is that? All the Windows Media Players, including 10 have really choppy video motion. Version 10 is slightly better but still not smooth. For some reason, I can only view a DVD movie in Media Player in full screen mode. Switching to a smaller screen causes the video portion to disappear. Nero's Showtime is about the same, maybe a little better. I'm not trying to take the lazy way out by posting this -- searching this forum or others doesn't seem to turn up any consistent answers. Does WinDVD in some way monopolize some of the Windows OS at the expense of other media players, or is it simply a superior product?