Don't be fooled by 'speed up' utilities.
There are an endless array of snake-oil solutions that claim to clean up your computer. Be very wary of these programs. Most of them do a very basic set of tweaks that will give a temporary boost or (as is often the case) release their real payload: an infection!
How often do I need a tuneup?
In the same way that you perform routine maintenance on your car, a regularly scheduled tune-up on your computer can often discover problems before they become unmanageable. It can also greatly extend the life of your machine. We recommend scheduling one every six months or so to keep things running smoothly.