Different BSODs - System Service Exception and Driver IRQL Most Common

I have recently been having problems with one of my Windows 7 x64 machines which was stable for about 7 months before it started having problems again. Before it was stable it had similar problems to what I'm seeing now, except it lacked BSODs. Reseatting the memory fixed those issues it was having before. It is similarly configured to another computer I have that runs fine, so part swapping is an available option for memory, video card, and processor.

It suffers from a seemingly random assortment of BSOD problems (though SYSTEM_SERVICE_EXCEPTION and DRIVER_IRQL_LESS_OR_EQUAL are the most common so far). Most of the BSOD point to ntoskrln.sys driver, one has pointed to the Nvidia driver (nvlddmkm.sys). It also sometimes crashes outright without a BSOD, going black and then restarting or just freezing. The BSOD and other restarts happens mostly when playing video games, but has also happened watching Hulu, or letting it sit at the desktop. When it restarts seldom does it not post the BIOS and give a BIOS error code instead. I haven't recorded the beep codes, but it appears to be long beeps running continuous without end; which according to Gigabyte means "memory not correctly installed".

I have tried updating my BIOS, chipset and video card drivers; but have found older Nvidia drivers to be more stable. Though this could just be coincidence as the crashes are random and the machine can be stable for hours playing a game one day and then suffer repeated crashes the next. I have reseated the video card and RAM (haven't swapped RAM with my other machine yet or taken some sticks out). I have monitored temperature on the video card and processor running stress testing programs and while they run closer to hot than I'd like, they don't reach critical levels. The video card stress Fur Mark has sometimes caused a reboot. I have tried underclocking the video card (which comes overclocked). I have run hard drive scans (CHKDSK and HDDScan, no errors), Memtest86 (9 hours, no errors), and driver verifier (caused one of the BSODs immediately on loading Windows, but didn't identify a driver).

Nvidia recently released a new driver, so I thought I'd try that since the Nvidia driver being reported in the one BSOD tempted me to, but that didn't help (and may have hurt), so I used system restore to go back to the version currently running.

My suspicions at this point are the drivers are a false lead and that it is memory or the memory connectors. My next step is going to be trying to run the computer without the oldest sticks in the machine (two came with the machine and two were purchased at a later date) and see how it fairs.

Thanks for any help you can provide.

Edit: SFC /scannow was run as well without finding errors. Added attachments generated by SF Diag.

Additional information is required.

1. Download the DM Log Collector application to your desktop by clicking the icon below



2. Run it by double-clicking the icon, and follow the prompts.
3. Locate the .ZIP file created on your desktop, and upload it here in your next reply.

OK. Can you try this .bat file instead?

Right-click on it, and choose 'Run as administrator'

Code:

*******************************************************************************
*                                                                             *
*                        Bugcheck Analysis                                    *
*                                                                             *
*******************************************************************************

Use !analyze -v to get detailed debugging information.

BugCheck C5, {1001, 2, 0, fffff80002fc16d6}

*** WARNING: Unable to verify timestamp for nvlddmkm.sys
*** ERROR: Module load completed but symbols could not be loaded for nvlddmkm.sys
Probably caused by : Pool_Corruption ( nt!ExDeferredFreePool+c82 )

Followup: Pool_corruption
---------

Code:

2: kd> lmvm nvlddmkm
start             end                 module name
fffff880`0483b000 fffff880`052e6000   nvlddmkm T (no symbols)           
    Loaded symbol image file: nvlddmkm.sys
    Image path: nvlddmkm.sys
    Image name: nvlddmkm.sys
    Timestamp:        Fri Mar 15 12:07:00 2013 (51427B3C)
    CheckSum:         00A8D47C
    ImageSize:        00AAB000
    Translations:     0000.04b0 0000.04e4 0409.04b0 0409.04e4

Lets revert to the 314.22 WHQL driver only. Uninstall the following Nvidia items in Control Panel > Programs and Features:

- 3D Vision Control Driver
- 3D Vision Driver
- Graphics Driver
- HD Audio Driver
- PhysX
- Nvidia Update

Now follow Drivers - Clean Left over Files after Uninstalling

Reboot. Go to Drivers - Download NVIDIA Drivers

Download 314.22 WHQL. While installing, Select Custom (Advanced) install. In the next page, follow this settings:



Reboot. Use system as normal.