I burned about 15 movies to DVD+R discs before I realized that my old (about 5 years) DVD standalone player would not play then properly. I was trying to copy the ISO file from the DVD+R onto a DVD-R. It doesn't seem to be working. I'm using DVD Decryter mostly but I've also tried Nero. Is there something I'm missing? Is it possible, or do I need to use the original again?