CPU at high temperature!?

Your system is NOT overclocked. The stock speed of a Q8200 processor is 2.33 GHz, which is exactly what you're running. Overclocking increases the frequency to get more computing power out of a processor - but it also generates more heat in the process.

83 C is hot for cores. If your cpu fan is running, hopefully at max speed, then you'll want to turn off your computer and check if the heat sink fins underneath the fan are filled with dust. If so, clean it. Bad airflow is the #1 cause of overheating.

Another possibility is removing the heatsink and not properly cleaning and reapplying thermal interface material. Heat doesn't flow rapidly from the processor to the heatsink if some sort of heat conductive material isn't placed between them.

If the fan itself is working, I would question the thermal grease that is supposed to transfer heat from the processor to the heatsink (which the fan cools).

Are you doing a lot of work to warrant such a hot processor? It is possible that some unknown process (or virus) is doing work behind your back.

Also check the airflow inside your computer. Blow away any dust on heatsinks and vents with compressed air, verify that case fans are blowing in the proper direction (usually outward for rear and top fans, inward for everything else), and that cables or other obstructions aren't trapping heat. Keep in mind that opening a case can sometimes disrupt the airflow, or cause heated air to flow back into the case.

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Overclocking is when you use BIOS settings (or special programs) to increase a processor's performance beyond its normal operation, by increasing voltage, clock rate, and others. OCing almost always increases heat, and sometimes requires more cooling power than a stock fan can supply. Unless you made changes yourself, your system probably isn't overclocked.

Cpu Q8200

Overclocking is the setting where you push your computer's processing time to the limit.

Basically, when you purchase a processor it indicates a speed. In the BIOS (Basic Input Output System), you can modify the speed of the processing time of your processor.

The higher the speed the faster it will get HOT.

So, if you're processor is OVERCLOCKED. I recommend you to add a CPU fan or any cooling device to you're unit so it will prevent the sudden turning off of your unit.

it might be worth trying to put new thermal paste on the cpu to transfer heat better to the heatsink, you remove the heatsink and clean off any paste that is there from the heatsink and the cpu, then apply new paste as directed on the paste packaging and refit the heatsink, there is one paste called arctic silver or something like that and that is supposed to be the bestfor heat transfer, also clean everything so there is no dust in the fans, heatsink etc, you might try ther cleaning first to see if that helps