We all know that most things run a little better when they're clean. Water flows easier when your plumbing is clean, your car's engine runs better if you've been taking care of it, and your dryer does more in less time when you clean out the lint.
Your computer is no different. Keeping your files and folders tidy in your virtual world and clearing the dust and grime that builds up inside and outside your computer all play a part in keeping it running smooth day in and day out.