This policy setting specifies whether Security Center is turned on or off for computers that are joined to an Active Directory domain. When Security Center is turned on it monitors essential security settings and notifies the user when the computer might be at risk. The Security Center Control Panel category view also contains a status section where the user can get recommendations to help increase the computer's security. When Security Center is not enabled on the domain neither the notifications nor the Security Center status section are displayed. Note that Security Center can only be turned off for computers that are joined to a Windows domain. When a computer is not joined to a Windows domain the policy setting will have no effect.If you do not congifure this policy setting the Security Center is turned off for domain members. If you enable this policy setting Security Center is turned on for all users. If you disable this policy setting Security Center is turned off for domain members.Windows XP SP2----------------------In Windows XP SP2 the essential security settings that are monitored by Security Center include firewall antivirus and Automatic Updates. Note that Security Center might not be available following a change to this policy setting until after the computer is restarted for Windows XP SP2 computers. Windows Vista---------------------In Windows Vista this policy setting monitors essential security settings to include firewall antivirus antispyware Internet security settings User Account Control and Automatic Updates. Windows Vista computers do not require a reboot for this policy setting to take effect.