Your cooling system should be flushed every other year. No, I'm not crazy, but with all the new chemicals they use today, it will literally eat up the rubber hoses and deteriorate the heater core, and the radiator core.
There is a program called Ccleaner that allows you to run a daily cleaning on your computer. It removes a dramatic amount of information without losing documents or any other important information.
1. Click on "Start" in the bottom left hand corner of screen
2. Click on "Run"
3. Type in "command" and hit ok