PC crashes in GTX 560 2 GB

My System Specs are
Windows 7 ultimate 32bit
Intel core i3 2100
Asus p8h61mlx mother board
4gb ddr3 ram
Zotac gtx 560 2 GB DDR5 graphics
Power supply unit is 450Watt

The games used to work fine earlier even at 1080P, but now recently all games just crash and my pc restarts.
Please help me out in this issue
2 answers Last reply Best Answer
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  1. Best answer
    heat. clean all fans, all heat sinks and clean the graphics cooling system. if you still have problems pull the heat sink from the processor, clean the old thermal paste off, reapply new, and reinstall heat sink/.
  2. Best answer selected by kaushal7290.
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