Windows 7 BSODS for months, can't figure out what exactly the problem is.

[tycischke]

As the title says, I have been getting blue screens for months. The minidumps come back with different causes, ntoskrnl.exe+75169 seems to be the only thing that's consistent in them. The blue screens happen seemingly random to me. I could be playing a game, watching a video, or just leave my computer idle at the desktop. I have gone through many steps to try and stop them and have not been successful at all. They happen usually every few hours, sometimes I can go half a day without having one.

I have reinstalled windows, tested my ram and video card, and have tried many different video drivers.
Here are two links to previous forum postings that outline some of the things I have already tried:
BSOD at random times. System_Service_Exception and atikmdag.sys. - Windows 7 Help Forums
Random BSODS Multiple times per day. - Windows 7 Help Forums

The most recent thing I tried is switching my graphics card to an older one I had. This seemed to have no effect and the bsods still occured randomly. At this point I am convinced it is a hardware issue, I just can't isolate what the problem is. Any further help is greatly appreciated. I'm pretty desperate to try and figure out what is wrong and how to fix it. I've attached the latest dmLog that I collected.

 

[tycischke]

I forgot to mention, my computer hasn't saved a minidump file since November 19th, and I have had plenty of bsods since then. I have it set to save them, and to not restart once a bsod occurs.

I was also wondering about the possibility of the cause being my motherboard. That is one of the oldest and cheapest parts of my pc.