Scenario: Installation Fails with “The Windows Installer Service could not be accessed”
This is a Windows Installer issue.
Try to perform next steps:
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.
Re-register Windows Installer Service: open command Prompt (Start -> Run -> cmd) and type next: msiexec /unregister msiexec /regserver