Basics of Projection Screen

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I apologize for my elementary question, but I am finding little on the web. I stumbled here and seem to have found a bunch of very smart people.
I just bought a Pioneer SD-P5062 rear projection screen. The alignment is off in the corners and the center is definately brighter than the sides. Is there any way I can fix this? At this point, any information on rear projection tvs would be helpful.

Thanks y'all!
 
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