Client Security antimalware agents running on Windows Vista, Windows Server 2008, Windows 7, or Windows Server 2008 R2, may be removed when using the Windows install updates and shut down feature to apply the Forefront Client Security March 2011 antimalware update described in the following article:
2508823 Forefront Client Security anti-malware client update: March 2011
The installation log file for the update, typically located at
%ProgramFiles%\Microsoft Forefront\Client Security\Client\Logs\mp_ambits.log, contains information similar to the below.
MSI (s) (90:84) [14:44:28:764]: Product: Microsoft Forefront Client Security Antimalware Service -- Error 1923. Service 'Microsoft Forefront Client Security Antimalware Service' (FCSAM) could not be installed. Verify that you have sufficient privileges to install system services. MSI (s) (90:84) [14:44:28:951]: Executing op: ActionStart(Name=ExecSecureObjects,,)
MSI (s) (90:84) [14:44:29:013]: Executing op: CustomActionSchedule(Action=ExecServiceConfig,ActionType=3073,Source=BinaryData,Target=ExecServiceConfig,CustomActionData=FCSAMrestartrestartnone115) MSI (s) (90:50) [14:44:29:013]: Invoking remote custom action. DLL: C:\Windows\Installer\MSI255E.tmp, Entrypoint: ExecServiceConfig ExecServiceConfig: Error 0x80070430: Cannot change service configuration. Error: The specified service has been marked for deletion
In this situation, the Security State Assessment(SSA) and Microsoft Operation Manager components remain installed.