It is difficult to say what is bad. The two most difficult hardware peripherals to determine are the motherboard and PSU. Unfortunately, we cannot determine these through internet troubleshooting unless you have an electrical background and know how to use a multimeter to check traces, voltage, and connectivity. If you do not, you will need to take these to a system technician who can find the hardware fault for you. We should do other steps before going that route, though.
Have you run the Memtest86+ diagnostics? They may reveal more manageable solutions.
Have you run the IntelBurnTest? Results?
What temperatures do you see during idle
What temperatures do you see during stress testing?
Have you tried a hardware stripdown?
Strip down your system to run only the bare essentials: one RAM module, the CPU, motherboard, one hard disk, one graphics card (or use onboard graphics if you have it), keyboard, mouse, and one monitor. See how the system behaves by running Windows for twice as long as it typically takes for you to get a crash. If it is stable, add one piece of hardware back at a time until you get crashes again. Take notes of what hardware you add and how the system responds to the hardware changes.
As you add and remove hardware, follow these steps for ESD safety:
- Shut down and turn off your computer.
- Unplug all power supplies to the computer (AC Power then battery for laptops, AC power for desktops)
- Hold down the power button for 30 seconds to close the circuit and ensure all power drains from components.
- Make sure you are grounded by using proper grounding techniques, i.e. work on an anti-static workbench, anti-static desk, or an anti-static pad. Hold something metallic while touching it to the anti-static surface, or use an anti-static wristband to attach to the anti-static material while working. If you do not have an anti-static workbench, desk, or pad, you can use your computer tower/case by finding a metal hold in it, such as a drive bay.
Once these steps have been followed, it is safe to remove and replace components within your computer.