COM+ Event System (EventSystem) Service Defaults in Windows 7

Supports System Event Notification Service (SENS), which provides automatic distribution of events to subscribing Component Object Model (COM) components. If the service is stopped, SENS will close and will not be able to provide logon and logoff notifications. If this service is disabled, any services that explicitly depend on it will fail to start.

Default Settings

Startup type:Automatic
Display name:COM+ Event System
Service name:EventSystem
Service type:share
Error control:normal
Object:NT AUTHORITY\LocalService
Path:%SystemRoot%\system32\svchost.exe -k LocalService
File:%SystemRoot%\system32\es.dll
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\EventSystem
Privileges:
  • SeChangeNotifyPrivilege
  • SeImpersonatePrivilege

Default Behavior

COM+ Event System is a Win32 service. In Windows 7 it is starting automatically on the operating system startup. Then the COM+ Event System service is running as NT AUTHORITY\LocalService in a shared process of svchost.exe. Other system components, such as drivers and services, may run in the same process. If COM+ Event System fails to start, Windows 7 attempts to write the failure details into Event Log. Then Windows 7 startup should proceed and the user should be notified that the EventSystem service is not running because of the error.

Dependencies

COM+ Event System is unable to start, if the Remote Procedure Call (RPC) service is stopped or disabled.

If COM+ Event System is stopped, the following services cannot start:

Restore Default Startup Configuration for COM+ Event System

1. Select your Windows 7 edition and service pack, and then click Download.

2. Save the Win7_EventSystem_Service_Startup.cmd file to a local storage device.

3. Run the saved file as an administrator.

4. Restart the computer.

The EventSystem service is using the es.dll file that is located in the %WinDir%\system32 folder. If the file is changed, damaged or deleted, you can restore its original version from Windows 7 installation media.