Why Does My Pc Keep Restarting Itself

And sometimes when I open an application, it crashes over and over again. And says that some of Windows is corrupt, but the files get OK when I restart the computer manually.

I’ve already formatted my PC for like 10 times because of this problem, but it still does not get fixed. And also it displays a lot of errors while installing Windows and also restarts automatically without any warning while installing Windows.

And the most funny part is that when I open the PC in Safe Mode, it does not restart automatically.

I think that it is a RAM problem or something? Because I already changed the processor, power supply and the hard disk even.