The solution to this problem is: 1. Check and start the SENS service to ensure that its startup type is automatic and running; 2. If the service is missing, check or restore the HKEY_LOCAL_MACHINEWindows could not connect to the System Event Notification ServiceSYSTEMWindows could not connect to the System Event Notification ServiceCurrentControlSetWindows could not connect to the System Event Notification ServiceServicesWindows could not connect to the System Event Notification ServiceSens key through the registry editor; 3. Run the sfc /scannow and DISM commands to repair the system files; 4. Check whether the Start value in the registry is 2 and confirm that the relevant functions are not disabled in Group Policy; 5. If the problem is limited to a certain user, you can create new user profile migration data; this problem is usually caused by the disabled SENS service or the system file is damaged, and it can be effectively solved after following the above steps.

This error message "Windows could not connect to the System Event Notification Service" usually occurs when you try to change your network settings, connect to Wi-Fi, or when the system is just booting. It may affect the display of network connection status (such as the network icon displays "No Internet access"), and may even cause login failure or Group Policy to be unavailable.

The core of this problem is that the SENS (System Event Notification Service) service has an exception or is disabled. Here are some common and effective solutions:

1. Check whether the SENS service is enabled and run

The SENS service must be in the "automatic" startup type and is running.

Operation steps:

• Press Win R , enter services.msc , and enter.
• Find System Event Notification Service in the Services list.
• Double-click to open and check the following:
  • Startup type : should be set to automatic
  • Service status : If it is not running, click Start
• Click Apply and OK.
• Restart the computer and see if the problem is solved.

?? Note: Some system streamlined versions or third-party optimization tools may disable the service and must be restored to "automatic".

2. Repair the SENS service item in the registry (if deleted or corrupted)

If the service is missing in services.msc , it may be that the registry key has been deleted by mistake.

Fix method:

• Press Win R , enter regedit to open the Registry Editor.
• Navigate to:

   HKEY_LOCAL_MACHINEWindows could not connect to the System Event Notification ServiceSYSTEMWindows could not connect to the System Event Notification ServiceCurrentControlSetWindows could not connect to the System Event Notification ServiceServicesWindows could not connect to the System Event Notification ServiceSens

• Check whether Sens item exists. If it does not exist, it means it has been deleted.

Recovery method (recommended):

• Find a computer with the same system version and export the registry key Sens .
• Copy the .reg file to the computer where the problem is and double-click to import.
• Or create it manually (not recommended, error-prone).

A safer way is to use the system file checker to try repairing first.

3. Run System File Checker (SFC) and DISM

System critical file corruption may cause SENS to fail to load.

Execute the command:

1. Open a command prompt (CMD) as an administrator.
2. Run the following commands in turn:

 sfc /scannow

Wait for completion and run:

 DISM /Online /Cleanup-Image /RestoreHealth

3. Restart the computer after completion.

This can fix system component corruption issues, including SENS-dependent files.

4. Check whether SENS is disabled in Group Policy or Registry

Some Group Policy settings or malware may disable the service.

• Open the registry and check:

   HKEY_LOCAL_MACHINEWindows could not connect to the System Event Notification ServiceSYSTEMWindows could not connect to the System Event Notification ServiceCurrentControlSetWindows could not connect to the System Event Notification ServiceServicesWindows could not connect to the System Event Notification ServiceSens

  Make sure the DWORD value of Start is 2 (indicates automatic startup).

• If you are using a domain environment, check whether Group Policy has disabled the "Notification Service" related function.

5. Create a new user profile (optional)

If the problem only occurs in a user account, it may be that the user configuration is corrupted.

• Create a new administrator account.
• Log in to the new account and test whether this error is still present.
• If it is normal, it means that the original user configuration is corrupt and the data can be migrated to the new account.

Summarize

This problem is mostly caused by the SENS service being disabled or corrupted . The most effective process is:

• ? Check and start the SENS service (most important)
• ? Run sfc /scannow to repair system files
• ? Check whether the service items in the registry exist
• ? Repair or rebuild user configuration if necessary

Basically that's it. Not complicated, but easily overlooked.

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