Can't run any games made by valve, help me.

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KronosX

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Aug 15, 2014
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I just built a computer:
PSU: Corsair 550w
GPU: Sapphire Radeon
CPU: AMD FD6300WMHKBOX FX-6300 6-Core Processor Black Edition
MOBO: M5A78L-M LX

Everytime I try to run CS:GO or Portal 2 my screen goes black and then a little text box comes on my screen and says "Not Supported".

I tried updating my GPU and MoBo drivers but it still doesnt work, any ideas?
 
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