Here's our Tip for.. April 27, 2008
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Stop Nagging Me!
Windows Vista hates it when you don't use an antivirus program, a firewall, or some other security feature or software; but if you don't need one part of its built-in security, you also don't need the Security Center shield icon to pop up constantly in the system tray.

Right-click the icon and click Open Security Center. Then, in Security Center, click Change the Way Security Center Alerts Me. You want to select Don't Notify Me and Don't Display the Icon (even though Windows tells you it's "Not Recommended").