Let us make sure of the settings, both import and export.
What Premiere Elements 11 project preset are you setting or is the program taking over to set it for you? Check out Edit Menu/Projects Settings to see what is set for the project by whomever.
What are the properties of your source media:
Progressive or Interlaced video
Pixel Aspect Ratio
When you export to MPEG or AVI, what are your export settings and are you customizing them at all under the Advanced Button of the preset...
I am looking for
MPEG or AVI
and then what are you putting in the field that says Presets:
after that are you customizing the export settings for that preset under the Advanced Button/Video Tab?
Let us start here and see if we can straighten all this out in the next few hours to avoid crunch time tomorrow night.
Welcome to the forum.
The black bars indicate a mis-match between the Project's Frame Size, and the Source Footage/Stills.
The answers to ATR's questions will point up where those mis-matches are.
This article will go into some detail on the causes, and many of the fixes: http://forums.adobe.com/message/3797172#3797172
Good luck, and let us know more, per ATR's questions, please,