Tarkus,
It's highly recommended that you enable the firewall (or use a third-party
firewall such as Sygate Personal Firewall, Zone Alarm etc). If you're
already running a 3rd party firewall, and want to disable the Security
Center notifications, use these steps:
Disable monitoring:
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Open the Security Center ( Type WSCUI.CPL in the Start, RUN box ). In the
Security Center, under Firewall, click Recommendations. In the
Recommendations dialog box, select the I have a firewall solution that I'll
monitor myself check box, and then click OK.
Disable notifications
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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.