Cookies and Web Beacons
Controlling Your Privacy
Please, be aware that you can adjust your browser settings to deactivate cookies if you have privacy fears. Deactivating cookies for all sites is not advised as it may get in the way of your use of some sites. The most efficient option is to deactivate or activate cookies on a per-site basis. Refer to your browser documentation for directions on how to deactivate cookies and other tracking mechanisms.
About Google Advertising
Removing cookies does not directly mean you have permanently opted out of any ad program. Except you have settings that block cookies, the subsequent time you visit a site running the ads, a new cookie will be stored.