mbuilder or terrogen(these all run at 99-100% when running or rendering).
This may come to late, but if your continuously straining the CPU at 100% for extended periods (like overnight) more than likely it's a cooling issue.
To resolve, add a bigger but compatible fan to your CPU to help cool the straining CPU. In addition add a case fan for cool air intake. There will be a little arrow on the fan indicating air flow.
Some people don't beleive this but I've seen it. Depending on how old your computer is or how often you strain the CPU at 100% for extended times, the "Thermal Paste" (the goo between the heat sink and the CPU) could be fading. When this happens the conducting factor that the Thermal Paste provides for the CPU
CAN also cause overheating and eventually CPU damage! If your comfortable in doing so, remove the heat sink and clean the top of the CPU and the bottom of the heat sink with a Q-Tip dipped in alcohol, but not alot you don't want to drown the thing, apply some more paste. Make sure it's not to much or little. About the size of a dull pencil tip is sufficient enough.
Thermal grease, to be exact. "Thermal transfer compound", if you want to be formal. It's the stuff you put between your CPU and your CPU cooler, to aid in the transfer of heat from the CPU to the Heat Sink.
If your still getting the overheat alarm while not compiling just playing MOH or system idle after adding fans and goo, there may be damage already done to the CPU.
Then if all else fails, I think we should take donations to revive you! We can't have our Supreme Commander down!
One more thing ViP, make sure there was no wine spilled on it!!!