If you find yourself asking this question on a regular basis, you are definitely not alone! Millions of people world-wide struggle with computers that gradually get slower and increasingly unresponsive over time. I myself battled with a frustratingly slow computer for many years. Some time ago I finally became annoyed enough about it to take action and learn how to fix it. Best decision ever! I spent hours searching and learnt heaps. My computer is now running almost as fast as when it was new.

Above text was excerpted from: http://whyismycomputersoslow.org