My computer suddenly reboot

My pc suddenly reboot or only when you start windows!
Indeed, loading windows crashes (always), and the moment of 5-10 min, reboot or cut (like a unplugged hot PSU ) May LEDs remain lit.

The temperature of my CPU goes up to 80 °, lack of leg heat, I tried to remove a memory sticks whether one of them was faulty. During the loading of windows and before the crash, the light blinks and my keyboard
Problem of PSU ? Change fan?

Make sure the CPU fan runs 80 ° because it is a lot.
That is what kind of processor?

But a processor does not at this temperature in such a short time. If it was on the first boot everything should work properly. However be sure to set this issue to avoid damaging your CPU advantage.