Click the Windows "Start" menu and click "Run" (Windows XP) or "Start Search" (Windows Vista and 7). Type "msconfig" (without quotes) and press "Enter" to launch the Systems Configuration Utility.
Click the "Startup" tab and remove the check mark from the "Googletoolbarnotifier" check box. Click "Apply" to save the changes and click "OK." When prompted, restart your computer.
Alternatively, disable Google Notifier from the Google Toolbar if you have it installed on your computer. To do so, launch the Web browser and click the wrench icon on the Google toolbar. Click "Options."
Click the "Search" tab and remove the check mark from the "Send Usage Statistics to Google" check box. Click "OK" to save the changes.