Is this crash a "suddenly the screen turns off and the computer reboots" thing, or do you get any pop-up crash info or BSOD with crash report info?
If its just "screen off/reboot" thing, then disable Automatic Restart in Advanced System Properties.
- Press Windows Key + R and type SystemPropertiesAdvanced
- Select Settings in the Startup and Recovery section
- Uncheck "Automatically restart"
- Click OK and close out the System Properties window, then reboot the computer
Now, if the computer crashes due to a software issue or a problem with the game or drivers, you will be able see to what has happened software wise.
If the computer however still restarts as it has been, then it is a hardware or BIOS issue