Newbie question

[NATASisSATAN]

I had 2 bin files that i used with isobuster to get 2 Mpegs. Ive joined them together using TMPGenc. when i burn with Dvdlab it goes out of sync at the halfway point of movie. What can i do to fix this? Or what do i use to check the file before getting started. I know this has been posted already but i just cant figure it out.

[Quassy]

Can anyone out there help???
I am having problems with Nero 6 Studio. After I add The BUP & IFO files, the Burn button doesnot illuminate therefore I cant burn to the DVD. I asked Nero for help but have never got an answer>