Event ID 809

A security event source has attempted to unregister.
    Primary User Name:  %1
    Primary Domain: %2
    Primary Logon ID:   %3
    Client User Name:   %4
    Client Domain:  %5
    Client Logon ID:    %6
    Source Name:    %7
    Process Id: %8
    Event Source Id:    %9
    Image File Name:    %10