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Cleaning your computer is very essential. Some of us take pains to clean unwanted files and folders so that we get better performance out of our computer but, we don’t actually clean our computer. Open up that cabinet and smell the dust. (I am sure; you’ll get an asthma attack if you do that).
Regularly cleaning your computer opens up the clogs/vents and gives space to free circulation thereby reducing heat in the system. I’ve had to repair 2 computers last week that had fans inside completely covered with dust particles. Microsoft has a pretty decent page about computer cleaning here