Event ID 6004 — The winlogon notification subscriber <TrustedInstaller> failed a critical notification event.

{
  "system": {
    "provider": "Microsoft-Windows-Winlogon",
    "guid": "{DBE9B383-7CF3-4331-91CC-A3CB16A3B538}",
    "event_source_name": "Wlclntfy",
    "event_id": 6004,
    "version": 0,
    "level": 3,
    "task": 0,
    "opcode": 0,
    "keywords": 36028797018963968,
    "time_created": "2013-10-23T17:32:12+00:00",
    "event_record_id": 181,
    "correlation": {},
    "execution": {
      "process_id": 0,
      "thread_id": 0
    },
    "channel": "Application",
    "computer": "IE8Win7",
    "security": {
      "user_id": ""
    }
  },
  "event_data": {
    "Data": [
      "TrustedInstaller"
    ],
    "Binary": "aQYAAA=="
  },
  "message": "The winlogon notification subscriber <TrustedInstaller> failed a critical notification event."
}