When I try to run multiple games or clients, when I try to alt tab into the one I already had open all I get is that games cursor and a black rectangle at the top left of my screen.

 

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Might want to give more information...like the game your playing and the Hardware specification of the LAPTOP your trying to use.

Laptop? I laughed. I wouldn't even think of running multiple games/clients on most laptops.

Gigabyte X58A-UD3R
i7-920
12GB DDR3-1600
EVGA GTX 470
Crucial M4 128GB
WD Black 500GB
Corsair AX850

It happens with any game, doesn't matter which game. It just recently started doing this.

 

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This is acting like a driver or interrupt conflict.

 

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Try an older GPU driver.