You say you have already done the REQUIRED Run as Administrator http://forums.adobe.com/thread/969395 for a dual layer DVD, so I'll let that rest
Some other things to consider and try...
Odd Errors http://forums.adobe.com/thread/670174
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Long File Names or odd characters cause problems
Read http://forums.adobe.com/thread/588273
And #4 http://forums.adobe.com/thread/666558
And This Message Thread http://forums.adobe.com/thread/665641
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Things and Software to AVOID when authoring/burning a disc... says Encore, but also applies to Premiere Elements and disc burning
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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)