Right-click the Computer icon, wherever it is on your system, and select Manage. (Im uses the Classic Start menu, so the computer icon is on my desktop. If you use the new Start menu, the icon is on the Start menu.) This opens the Computer Management utility.
Select Services, right-click the Windows installer in the list, and select Properties. If you encounter a problem, the Windows Installer service is running and the Stop button is disabled. Just rebooting does not stop the service. Here's how you stop it.
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