My screen is showing squares[HELP]

I'm getting all these squares on my desktop, when playing games, everywhere!

I took screenshots of my problem.^Link Above^

I have an i7 840QM
Nvidia GTX 260m

They appear in two of my games
Games I play: Starcraft2. CoD:MW2. CoD:BO. BFBC2
The squares appear when I turn in Windows Aero, when I play BFBC2 and CoD:BO
Never happened with SC2 and MW2.
Is this a software or Hardware problem?
I have tried doing a clean reinstall of my Nvidia Drivers.
Any help would be greatly appreciated, thanks.
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More about screen showing squares help
  1. It could be an overheating problem.
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