BSOD SYSTEM_SERVICE_EXCEPTION 0x3b  

An old Nvidia driver is flagged, possibly related to your GPU as I don't see anything else related to Nvidia.
Please uninstall everything of Nvidia using Display Driver Uninstaller and install new drivers from Nvidia. Be sure the clean install box is checked and only install the Graphics driver and the PhysX driver, you can use this tutorial for the installation part NVIDIA Drivers - Avoid Problems - Windows 7 Help Forums
Attachment 98402

Code:

1: kd> lmvm nvoclk64
Browse full module list
start             end                 module name
fffff800`c6400000 fffff800`c6410000   nvoclk64 T (no symbols)           
    Loaded symbol image file: nvoclk64.sys
    Image path: \SystemRoot\system32\DRIVERS\nvoclk64.sys
    Image name: nvoclk64.sys
    Browse all global symbols  functions  data
    Timestamp:        Tue Sep 15 23:59:25 2009 (4AB00E3D)
    CheckSum:         0000D2EB
    ImageSize:        00010000
    Translations:     0000.04b0 0000.04e4 0409.04b0 0409.04e4

A few questions hardware-side,
Could you try to seat the GPU into a different slot?
Your CPU does not support the 1600MHz frequency your memory is running on, I'm not very familiair with Crucial but is it possible to get the frequency of the memory to 1333MHz?

Please fill in your system specs

Please follow this tutorial and download the tool. The tool will give you detailed information about your system specs, please fill in your system specs more completely including PSU, cooling and other used stuff like mouse, keyboard, monitor, case, etc.
The PSU, cooling and other stuff are NOT mentioned in the tool.

How to fill in your system specs:

You could check in the Ai Tweaker Menu in the BIOS for the memory frequency options.

850MHz is an unlikely selection, according to the documentation it should be 800MHz or 1066MHz.

From what I saw your memory runs at 1600MHz, this needs to go to 1333MHz.

The 800MHz & 1066Mz mentioning was only because 850MHz isn't possible.

You could always test your PSU, PSU - Test DC Output Voltage - Windows 7 Help Forums, but a 5y PSU may indeed go south slowly.