[Fix] Cannot install or uninstall program in Safe Mode

If you’re going to uninstall program in Safe mode, you may receive this error message:

The Windows Installer Service could not be accessed. 
This can occur if the Windows Installer is not correctly installed. 
Contact your support personnel for assistance.

The Windows Installer Service could not be accessed

By default, Windows Installer service is not running in Safe mode so you can’t install or uninstall some program. To fix this issue, you have to add a registry entry for Safe mode that you’re using and start the Windows installer service. In this article, I will show how to fix this issue using command prompt on Windows 10.
Note: The steps are the same for Windows 7 and 8.

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Step-by-step

  1. Open command prompt as an administrator.
    • On Windows 8/10, right-click Windows icon at bottom left and select Command Prompt (Admin).
      Open command prompt as Administrator
    • On Windows 7, click Start button, type cmd in search field and right-click the cmd program and select Run as administrator.
  2. Type this command and press Enter
    REG ADD "HKLM\SYSTEM\CurrentControlSet\Control\SafeBoot\Minimal\MSIServer" /VE /T REG_SZ /F /D "Service"

    Add an entry in Windows registry
    Note: If you’re in Safe mode with networking, you have to replace the text Minimal with Network.

  3. Start Windows Installer service by type this command.
    net start msiserver

    Start Windows Installer service

  4. Now you should be able to install or uninstall the program.
    Successfully uninstall program in Safe mode

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