I accedentely activated a strange mode and i want to turn it back but dont know how

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I accedentely activated a strange mode and i want to turn it back but dont know how
my screen has a black frame arround new and old files. i want to standard mode back.
Repaly
Hi,
Your using windows 8 and photoshop cs5?
If you right click on the black area and choose a different color does that make a difference?
If that doesn't work, then it looks like it might be the your graphics card driver.
Could you post the info you get under Help>System Info from within photoshop cs5?
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