Hard to say what it is. The error code you posted is merely telling you there was a memory dump.
First thing to do is remove one module and reboot. Does it boot.
Change memory modules and reboot again. Which one works. If both work, it is not memory, but more likely a hard drive failure or glitch.
Yes the computer works fine now. But within a month this has only happened twice. All of the sudden the PC shutsdown and reboots without warning. Is there some sort of logging I can setup to monitor and find out whats wrong?