Security Center application in Vista informs users about their security settings if not configured properly, by displaying a balloon in the system tray. At times, this could prove to be quite irritating. If you would like to disable these prompts, follow the steps below:
Right-click the Security Center icon and select 'Open Security Center'.
Click the 'Change the way Security Center alerts me' link.
From the 'Do you want to be notified . of security issues' window, click 'Don't notify me and don't display the icon (not recommended)'.
