>nero
That may be your problem - Things and Software to AVOID when authoring/burning a disc
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Start --> http://forums.adobe.com/thread/608660
#2 has WHY Explained http://forums.adobe.com/thread/607390
Plus http://forums.adobe.com/thread/562941
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Create a DVD output ISO file (Encore) or set your DVD output to a folder on your hard drive (Encore or Premiere Elements) and then use the FREE http://www.imgburn.com/index.php?act=download to write files or folders or ISO to disc for DVD or BluRay (send the author a PayPal donation if you like his program)