I have a computer in my house that is incredibly noisy. It's heatsink fan would become incredibly loud after having it on for a few minutes or running high priority applications such as games. I have cleaned out all the dust inside the computer and it is still noisy. I want to underclock it but when I went into BIOS, there was no way for me to change the multiplier or FSB. How can I go about underclocking this computer? Is there a windows program I could use?