As per T774033, when recorded in relation to Microsoft Antimalware software, this error code indicates that one or more of the scanning engine update files were not signed. Update the scanning engine by using Windows Defender.
As per QM974971, this is a bug in Windows Vista. A hotfix (post SP1) is available.
Build a great reporting interface using Splunk, one of the leaders in the Security Information and Event Management (SIEM) field, linking the collected Windows events to www.eventid.net.
Obtain enhanced visibility into Cisco ASA firewall logs using the free Firegen for Cisco ASA Splunk App. Take advantage of dashboards built to optimize the threat analysis process.