Symptoms

1. You are installing Acronis True Image (any version) 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.

Cause

Issue in the Windows Installer.

Solution

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.