I've got a problem. I used Nero Express for the first time to burn 4 - 30 minute .mpg files, tv shows recorded from a TV capture card, to a DVD. I created a menu on the disc, with four chapters. I let it adjust quality to fit on the DVD. It took approx. 3 hours to encode and burn to the disc, which showed as being successful. It plays on my pc using Nero Showtime, but it will not work on any of my 3 DVD players in my house. It just spins for a minute then says "No Disc". What is going on? I'd hate to have to wait 3 hours each time I want to try it again.