help please Computer keeps freezeing and shutting off

(sorry for my bad spelling) Hello my computer keeps freezeing or shutting off when it freeze's i cant do anything but click the power button and when it shuts off it restarts it self it only does these things within 30 mins after start up ive tried cleaning my video card it worked for a few months but now it doesnt if anyone could help it would be awesome :) here are my specs
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More about computer freezeing shutting
  1. the nvidia driver are from february did you try to update them and what are the temp in the system when was the last time you did a dust off ?
  2. Sick power supply.
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