Try the firewall repair tool -
http://social.microsoft.com/Forums/en-US/onecarefirewall/thread/e67b1989-afd5-47e5-a393-3a551c7c7e60 If the repair tool does not resolve the issue please contact support. How to reach support -
http://social.microsoft.com/Forums/en-US/onecareinstallandactivate/thread/30400b52-7f26-4ba0-bc18-17e305329d90
Jim - MVP Windows Live - Forum Moderator - Live One Care - Live Mesh - Microsoft Security Essentials