By default, Windows 7 uses the default Aero theme which includes things like a transparent taskbar and transparent windows and includes Aero peek that lets you see your desktop or program preview when you hover your mouse over any open program. These are all nice, but unnecessary. Having sounds enabled also uses up system resources.
Right click on your desktop, select “Personalize” and scroll down to the “Basic and High Contrast Themes” and select “Windows 7 Basic”.
At the bottom of this window, you should also see and icon called “Sounds”. Click this and in the popup window under the “Sound Scheme” select “No Sounds” and click OK.
You’ll be surprised how fast your computer now performs!