SchizTech :
OK, a couple of ideas to test:
-> run memory diagnostics (Windows built-in tool, or memtest86)
-> try without video card, running off onboard graphics.
I ran the memory diagnostic, and didn't find any issues. Right now I have my graphics card out and have been using the computer for about an hour. When the crashes happened before it was pretty random, but it hasn't happened yet.
I've been thinking about the problem more. Could the problem be related to not having a big enough power supply?
Besides what I listed for specs, I have 2 HDDs, 2 SSDs, 2 optical drives, a water cooler, and a wireless card on a 550W