I have no idea what i have done wrong, but every time i try to export my video, it ends up with the clips and pictures in the middle of the screen and just black blank spaces surrounding it...? Can anyone help me change this?

maybe the clips in your project don't have the same dimensions as your export/project settings.

what type of video clips are you editing?
what format are they?
what are their dimensions?

have you changed the export settings from the defaults?

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P4 1GB Ram 50+160GB, Win XP, Premiere 6, Encore+Photoshop, Lite-on 4x dvd rw.
Sony TRV-250, Panasonic NVGS-75, Canon MV600i