This issue occurs by design in the 2007 Office and Office 2010 products. You cannot install a 2007 Office suite or an individual 2007 Office program, or an Office 2010 suite or individual program by running an .msi file that is provided in the Office suites.
To resolve this issue, you must run the Setup.exe file. To do this, locate the Setup.exe file in the root folder of the installation source, and then double-click the file.