I have wrote an article on the suject:
---------------------------------------------------
Do you find that your computer is running slower and slower, day after day? This article will try to help you to improve its performance. When you make music with your computer, you need to take advantage of all the power that sits on the CPU (main processor). You have paid big $ for your computer, and you probably don’t use all the super horsepower available.
Read the complete article (http://nuton.ca/g_clean-computer.html)