Here are the main causes of this error and you figure out a better solution toward this issue: So how to fix 'Windows Installer Service could be not accessed' or resolve Windows installer is not working issue? Windows Installer is a Microsoft Windows component that is used for software installation, maintenance, and removal. Check out how to make Windows installer work again so as to install new software on your PC. The provided methods can be applied to help you effectively fix the same issues on Windows 10/8/7, etc.
Install the Latest Version of Windows Installer We advise you to remove or uninstall the old version from your PC in advance. Uninstall Older Version of Software/Program Type cmd in Windows Search box and right-click on Command Prompt, select 'Run as administrator'.
