If when you start your pc you get the failure message:
"Failed to Connect to a Windows Service - Windows could not connect to the System Event Notification Service.... etc
then the problem can usually be resolved by setting the "Windows Modules Installer" to manual.
If you are new to this or not particularly technically minded then the
following will explain how to do this.
Click Start > Run.
Now type services.msc and click OK.
Scroll down the window until you find Windows Modules Installer.
Double click it. This will bring up it's Properties box.
Click the Startup type drop down list. Here you will see a number of options in the menu.
Select Manual. (you may have to select Disable instead)
Click Apply.
Click OK to close its Properties box.
Close the Services window.
Restart your computer.
IMPORTANT: if you had to Disable, you will need to change it back to Enable to download any Windows Updates.
Afterwards, you might find that your firewall notifies you by display a popup with a message along the lines of "the Windows Modules Installer is trying to modify an existing driver...." and asks you to select 'Allow' or 'Deny'. It is quite possible that if you select 'Allow' that the Windows Modules Installer will reset to Automatic again.. so just select 'Deny'.
NOTE: if you look in the Windows Task Manager (Ctrl+Alt+Del) and select the 'Services' tab, you will note a service called TrustedInstaller. This is the culprit. When you open Windows Modules Installer in the Services window as explained above, you will see that is what it's called. So just set it to manual.
Clark

