Not dumb at all, you're doing fine.
To see your system specs, run
Everest and go to Report > Quick Report All Pages > Plain Text. Post back with the saved text report.
The PSU is the power supply unit, the large box at the top rear of your PC case. Remove the side panel from the case to see the PSU label. We need the make, model and total watts. (eg. Make:Thermaltake, Model:Toughpower, Watts:650W)
If the PSU is too weak for the computer, it can lead to overheating, graphics problems and crashes, so we like to check this first before moving on to the troubleshooting.
Did you take the SpeedFan readings with any other programs running?
The voltages are ok, all within 5% of where they should be, but the temperatures are a bit high for an idle system, and I suspect they will be higher when you're rendering, which could lead to the computer crashing. The hard drive is about 10C too hot, so your problem could be due to poor air circulation and ventilation.
The safe maximum temperature for CPUs varies depending on the CPU model, and can be anywhere between 60-90C. We'll get a better idea of how dangerous your CPU temperature is after you post the Everest report. If it's too hot, you'll have to clean off the existing thermal paste and reapply some high quality Arctic Silver paste (only about $5US).
While you've got the side panel off the case, blow a can of compressed air around the fans, heatsink and card slots to remove any dust. Also, make sure all the fans are positioned correctly and spinning. There should be one at the front of the case pulling cool air in, and one at the back blowing warm air out. Apart from the case fans, also check the fans on the CPU/heatsink and graphics card.
As for Sony Vegas, I'll leave that to the video experts.
