Windows Vista Services

System Event Notification Service - Windows Vista Service

Monitors system events and notifies subscribers to COM+ Event System of these events.

This service also exists in Windows 10, 7, 8 and XP.

Startup Type

Windows Vista edition without SP SP1 SP2
Starter Automatic Automatic Automatic
Home Basic Automatic Automatic Automatic
Home Premium Automatic Automatic Automatic
Business Automatic Automatic Automatic
Ultimate Automatic Automatic Automatic

Default Properties

Display name:System Event Notification Service
Service name:SENS
Path:%WinDir%\system32\svchost.exe -k netsvcs
Error control:normal
  • SeAuditPrivilege
  • SeChangeNotifyPrivilege
  • SeCreateGlobalPrivilege
  • SeImpersonatePrivilege
  • SeTcbPrivilege

Default Behavior

The System Event Notification Service as LocalSystem and runs in a shared process of svchost.exe. If System Event Notification Service fails to start, the error is recorded into the Event Log. Windows Vista startup proceeds, but a message box is displayed informing you that the SENS service has failed to start. At least one service depends on System Event Notification Service. Therefore I do not recommend you to disable it.


System Event Notification Service will not start, if the COM+ Event System is stopped or disabled.

If System Event Notification Service is stopped, the COM+ System Application fails to start and initialize.

Restore Default Startup Type of System Event Notification Service

Automated Restore

1. Select your Windows Vista edition and Service Pack, and then click on the Download button below.

2. Save the RestoreSystemEventNotificationServiceWindowsVista.bat file to any folder on your hard drive.

3. Right-click the downloaded batch file and select Run as administrator.

4. Restart the computer to save changes.

Note. Make sure that the sens.dll file exists in the %WinDir%\System32 folder. If this file is missing you can try to restore it from your Windows Vista installation media.

Yea, though I walk through the valley of the shadow of death, I will fear no evil: for thou art with me; thy rod and thy staff they comfort me.