Windows could not connect to the System Event Notification Service service

[Mohammed Ullah]

Symptom:

Are you unable to log in with your Standard User account on Windows?

And even when you log in using an administrator account, you find this error message:

“Windows could not connect to the System Event Notification Service service. This problem prevents standard users from logging on to the system”

or 

“Failed to connect to a Windows service. Windows could not connect to the System Event Notification Service service.”

[#2]

Solution:
1- Restart and/or Enable System Event Notification Service, Windows Font Cache Service, DHCP Client Service.
2- reset the Winsock Catalog (c:\>netsh winsock reset)
caution: applied to win7 only, before run above winsock command, run below two commands first:
@echo off
REG ADD "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Windows" /v LoadAppInit_DLLs /t REG_DWORD /d 00000000 /f
REG ADD "HKLM\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Windows" /v LoadAppInit_DLLs /t REG_DWORD /d 00000000 /f

3- update video card drivers
4- uninstall the Widows KB2952664 update
List installed version of the update:
dism /online /get-packages | findstr KB2952664

Remove one by one the versions:
dism /online /remove-package /PackageName:Package_for_KB2952664~31bf3856ad364e35~amd64~~6.1.1.3

Confirm everything is gone:
Get-HotFix -id KB2952664
It should display a cannot find hot-fix error.

5- Task Manager > Startup tab > Disable klhkum.dll process.
6- optimize Windows for faster performance
a. run Troubleshooter: Control Panel > Type troubleshooter > Select Troubleshooting > Go to System and Security> click on Check for Performance Issues.
b. Disk Defragmentation
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