Frequent hard hangs: Event ID 41 kernal-power

I realize that this issue has been posted several times, but I haven't seen any solutions that have been helpful.

CPU: Core2Quad Q6600 G0
RAM: 4gb DDR2 Corsair Dominator
Mobo: EVGA 780i
PSU: Corsair TX650W
Video Card: EVGA GTX 460 SE

Log Name:      SystemSource:        Microsoft-Windows-Kernel-Power
Date:          8/23/2012 6:13:38 PM
Event ID:      41
Task Category: (63)
Level:         Critical
Keywords:      (2)
User:          SYSTEM
Computer:      Razgriz
The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly.
Event Xml:
<Event xmlns="">
    <Provider Name="Microsoft-Windows-Kernel-Power" Guid="{331C3B3A-2005-44C2-AC5E-77220C37D6B4}" />
    <TimeCreated SystemTime="2012-08-23T22:13:38.317200000Z" />
    <Correlation />
    <Execution ProcessID="4" ThreadID="8" />
    <Security UserID="S-1-5-18" />
    <Data Name="BugcheckCode">0</Data>
    <Data Name="BugcheckParameter1">0x0</Data>
    <Data Name="BugcheckParameter2">0x0</Data>
    <Data Name="BugcheckParameter3">0x0</Data>
    <Data Name="BugcheckParameter4">0x0</Data>
    <Data Name="SleepInProgress">false</Data>
    <Data Name="PowerButtonTimestamp">0</Data>
Other information: I've had all of these components since I built the rig in september 2008 (minus the video card), I've had it overclocked from 2.4 to 3.2 for almost 3 years. I would get this error maybe once every 2 months, but I've been getting it more and more frequently to the point where now I get it once a day.

I downclocked from 3.2 to 3.0 (it can run that stable at stock voltage), ran a slow mem-test, ran prime 95 for over 12 hours where nothing happened, and it still hard hangs. I've got a zalman heat sink which keeps it under 50C even with prime 95 running so i don't believe it's an overheating issue, there's no extra noises or loudness coming out of my case.

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