Error 1723. There is a problem with this Windows Installer Package. DLL Could Not Be Run. (25476)

"Product: Spotlight on Exchange Enterprise Edition -- Error 1723. There is a problem with this Windows Installer package. A DLL required for this install to complete could not be run. Contact your support personnel or package vendor. Action SxsInstallCA, entry: CustomAction_SxsMsmInstall, library: C:\WINDOWS\Installer\MSI1ECD.tmp"

This occurs during the installation of the Database Components, but could happen during a complete install as well.

The Windows Installer is out of date, or is corrupted.

"Error 1723: There is a problem with this Windows Installer package."

Refer to Microsoft's download site to obtain Windows Installer 3.1 Redistributables (v2):

http://www.microsoft.com/downloads/details.aspx?familyid=889482fc-5f56-4a38-b838-de776fd4138c

1. Install the updated version of Windows Installer download above.

2. Reboot the computer.

3. Re-start the installation of Spotlight on Exchange.