the blue screen of death wrecks my ears, i play a game or watch a video and the crash times itself with the gunshot to blast my ears with BRRRRRRRRRRRRRRRRR as it stutters to death

if you're using windows, use Piriform CCleaner to cleanup your registry.

Don't forget to delete history from time to time because that can slow down the computer, make sure you have no viruses, reduce the amount of startup programs you have, and close programs that you're done using.