How to find out why Windows 10 rebooted?

Question

Windows

I went to the computer and on the screen the initial window of Windows 10 prompted me to enter a password
I launched BlueScreenView.exe, there was no data about the blue screen,
I tried to look at the Windows event log (I never started it, I don’t know what is there and how)
I didn’t find any information about the reboot
In the registry, I turned off auto reboot when updates according to this instruction:
Computer Configuration - Administrative Templates - Windows Components - Windows Update and double-click on the option "Do not automatically restart when automatically installing updates if users are working on the system."
How to find in the event log what caused the reboot?
PS
Found such an entry
Fatal hardware error.
Component: PCI Express Root Port
Error Source: BOOT
Bus:Device:Function: 0x0:0x0:0x0
Vendor ID:DeviceID: 0x8086:0x6F00
Class ID: 0x600
See the details of this entry for more information.

Answer 1

Windows creates 2 dumps with bluescreen - full c:\windows\memory.dmp and a short one in c:\windows\minidump folder.
They can be viewed using the WinDbg program, which now comes with WDK. Before viewing, be sure to download the debug symbols for your operating system.
If you can do all this - throw off the results of decrypting the mini-dump here, I'll try to help if you don't figure it out yourself.