Mish

Hello Computer Gods: I had Nero 9 for a trial run and loved it. I could burn a movie in no time so I decided to get Nero 10 thinking I might as well have the updated version. Now when I go to add a movie to burn from my file it's rejecting it or it's taking a really really long time when it didn't before. What am I doing wrong??? I have Nero Vision, Nero backitup and burn, Nero Smart Start etc...