Computer keep crashing very often

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I dont know exactly whats happening here, but for a while now, whenever I play my online games on my PC, after about 5 sometimes 10 minutes or quite rare more than 30min, the whole PC will crash, and black screen appear as if the computer is being shut down.

When i am connected to internet but not playing games, the crashing problem will still occur but at a later time or sometimes wont occur.

Anyone have any ideas what could be the problem.
it only happens during games, and at no particular point.
I've attached a copy of my DXDIAG Report, any help or advice would be much appreciated.
 
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