COM+ System Application (COMSysApp) Service Defaults in Windows XP

Manages the configuration and tracking of Component Object Model (COM)+-based components. If the service is stopped, most COM+-based components will not function properly. If this service is disabled, any services that explicitly depend on it will fail to start.

Default Settings

Startup type:Manual
Display name:COM+ System Application
Service name:COMSysApp
Service type:own
Error control:normal
Object:LocalSystem
Path:%SystemRoot%\system32\dllhost.exe /Processid:{02D4B3F1-FD88-11D1-960D-00805FC79235}
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\COMSysApp

Default Behavior

COM+ System Application is a Win32 service. In Windows XP it won't start until the current user starts it. When the COM+ System Application service is started, it is running as LocalSystem in its own process of dllhost.exe. If the COM+ System Application fails to start, the technical information about the error is added to the Event Log. Windows XP startup should proceed, but a message box should be displayed informing the user that the COMSysApp service has failed to start.

Dependencies

COM+ System Application depends on the Remote Procedure Call (RPC) service.

Restore Default Startup Configuration for COM+ System Application

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

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

3. Run the saved file.

4. Restart the computer.

The COMSysApp service is using the dllhost.exe 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 XP installation media.