PC keeps BSODing on most of the boots or it happens random while working

[f00ch0w]

So my PC has started to BSOD on almost every boot. If it doesn't BSOD on boot it will BSOD randomly once I'm doing something on PC. It displays several errors:

SYSTEM_THREAD_EXCEPTION_NOT_HANDLED
IRQL_NOT_LESS_OR_EQUAL
INTERNAL_POWER_ERROR
SYSTEM_SERVICE_EXCEPTION
KERNEL_SECURITY_CHECK_FAILURE
MEMORY_MANAGEMENT

I uploaded a picture of dump files tab in WhoCrashed. I can also upload the required dump files if needed.

http://i.imgur.com/f9u0JaB.png

Thanks a lot.

UPDATE: I've tried doing a clean install of GPU drivers, ran sfc /scannow (came back with no integrity violations), ran memtest86+ for 3 hours (no errors), Stressed GPU with FurMark for a hour. None of those triggered a BSOD.

 

[Dark Lord of Tech]

Specs would help!

 

[f00ch0w]

CPU: AMD Athlon II x4 620
MB: JW Electronics - JW-RS780G-UVD +
RAM: 6GB DDR2
GPU: Nvidia GeForce GTX 260

Here's the specs, also i've updated my original post

 

[Dark Lord of Tech]

PSU?

 

[Dark Lord of Tech]

Memory going bad possibly?

 

[f00ch0w]

PSU is Raidmax RX-500AF-B.

I've updated my first post, had memtest86+ run for over 3 hours. No errors were found

 

[Dark Lord of Tech]

You really need to get a better PSU to power your components.Not saying it's the issue , but that Raidmax is very very poor quality.

 

[f00ch0w]

You really need to get a better PSU to power your components.Not saying it's the issue , but that Raidmax is very very poor quality.

Tried with another PSU. Still the same thing. I've stumbled upon another symptom.

Once I shut it down and turn it on again, once it comes to Windows Logo it shuts down. I turn it on again and after Windows Logo it blue screens with this error message shown: SYSTEM_SERVICE_EXCEPTION

It might help someone to provide me an answer.

 

[f00ch0w]

Tried pulling out RAM sticks one by one and turning it on/off for each. No BSODs occured... Ran a CPU Stress test as my last idea which I'm currently out of...