49190: Acronis Software: Installation fails with "The Windows Installer Service could not be accessed"

Last update: 25-08-2021

This article applies to:

  • All Acronis software


  1. You are installing Acronis software in Windows
  2. Installation fails with:
    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.


Issue in the Windows Installer.


  1. Make sure Windows Installer Service is not disabled: Start -> Run -> services.msc -> locate Windows Installer Service and check its Startup Type; it should be set to Manual or Automatic. Click Start to start the service.
  2. Re-register Windows Installer Service: open command Prompt (Start -> Run -> cmd) and run the following commands:

    For Windows 32-bit:
    msiexec /unregister
    msiexec /regserver

    For Windows 64-bit:

    %windir%\system32\msiexec.exe /unregister
    %windir%\syswow64\msiexec.exe /unregister
    %windir%\system32\msiexec.exe /regserver
    %windir%\syswow64\msiexec.exe /regserver

  3. Follow this Microsoft KB article.

More information

Please contact Microsoft support if the issue persists.