Check these:
https://www-secure.symantec.com/connect/forums/wmi-calls-gather-sep-client-information
https://www-secure.symantec.com/connect/forums/determine-firewall-wmi-securitycentersecuritycenter2-firewallproduct-properties
https://www-secure.symantec.com/connect/forums/determine-sep-dat-signature-dateversion-wmi-or-registry