Computer overheating is mainly due to three causes. The airflow inside the case may be insufficient and cause heat to build locally. Certain components may overwork and generate more heat than usual. A high room temperature will create overheating. Errors caused by heat show as blue screens, system freezes, random shut downs or untraceable errors regardless of the application running. If component rearrangement doesn’t do the trick, products that do PC cooling can help.
Check for dust. Remove the computer's outer cover and see if dust has built up. Dust can reduce the airflow, it can slow down the fans or other mechanical components it gets into, or it can act as an insulator causing heat to increase. Use air pressure to remove the dust.
Inspect the temperature around the components that use the most power. These are, the CPU, the graphics processor, the power supply and the hard drives. Use your hand to assess the ambient temperature. It shouldn't be more than 2 degrees Celsius warmer than the room's temperature, while the computer is running. You can tape temperature sensors bought from a computer store, if unsure. Change the placement of the components or the fans to improve the airflow, if you found components blocking the air intake.