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Windows XP Tips, Illustrations and registry edits
The Security Center in Windows XP SP2 verifies the security settings of your computer (checks the status of anti-virus software installed, and the definitions; whether a third-party firewall is installed or not). If the Security Center does not find a firewall or anti-virus installed, it sends an alert via the Notification area. This is to inform that the system security is at risk without a firewall or an anti-virus program. Note that the Security Center can detect only a specific set of anti-virus and firewall products/brands. In case you're running a firewall and anti-virus program which the Security Center does not identify, it continues to alert the user on every startup.
To turn off these alerts, try this:
Do this if you have a good firewall program and anti-virus with the latest definitions installed.
In some configurations, the above setting does not stick and the Security Center keeps sending the alert again. If that does not work, try this:
Click Change the way Security Center alerts me. Clear the check boxes beside the items for which you don't want to receive alerts, and then click OK.
HKEY_LOCAL_MACHINE \ SOFTWARE \ Microsoft \ Security Center
NOTE: If you choose the checkbox I have a firewall solution that I'll monitor myself and the similar option for Anti-virus monitoring, both the values AntiVirusOverride & FirewallOverride are set to 1. For more information on the above two registry values, see: Changes to Functionality in Microsoft Windows XP Service Pack 2: Part 6: Computer Maintenance