Could be a heat issue, or a memory module stick gone bad depending on the BSOD message. If it's heat, it could be an easy fix like blowing out the dust from your machine (while it's off and unplugged) with compressed air. Also pc placement. Some desks are horrible for air flow. I saw one where you lowered the pc into it which made accessing the plugs and everything in the back a nightmare. The monitor sat on top of this design and the person had probably one of the largest flat panel monitor's I'd seen at the time. Took two of us to move the monitor to open the U shape the pc sat inside of. Even then two people needed to lift the pc out (one from the bottom of the desk pushing up the other lifting from the top). While the desk looked fantastic, it bad for large gaming sized rigs.

The dust settled, thinking "what a fine home, at least for now" not realizing that doom would soon be coming in the form of a vacuum cleaner.