If you run a Setup program not including the Windows Installer service, you might receive the subsequent error message:

The Windows Installer service can not be accessed. Contact your support persons to confirm that the windows Installer service is correctly registered.

The Windows Installer service does not begin if you clear the Load system services check box. To make use of the Windows Installer service when system services are not loaded, you have to begin the service physically. To do this, pursue these steps:

1. Click Start button, and right-click on My Computer, and after that click Manage. If you are provoked for an administrator password or for verification, type your secret word, or click Continue.

2. In the console tree, click Services and Applications, as well as afterward click Services.

3. In the details pane, right-click Windows Installer, and followed by click Start.