How to speed up your computer

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-If you haven't cleaned out your computer in a while (if ever), open up the side and vacuum the dust. Then use canned air to blow any caked in dust that may have accumulated in your CPU's heatsink. Then suck the dust you blew out.
How does dust slow your computer? Processors since Pentium 4 throttle (lower "ghz") when they reach a certain temperature in order to prevent burning.
Sometimes the dust buildup causes so much heat that your computer can automatically shut down (thanks HiiEN)

WHAT?! You can't do that! Putting a vaccuum to your computer could cause static electricity which could potentially damage hardware components.

The best thing to do is buy a can of aersol and blow air into the computer. best to do so outside, so the dust isn't everywhere in your house.