In this setup of Barcode Maker, Windows Installer have not been included as most Windows 2000 and Windows XP and Windows Vista have Windows Installer included and/or installed already. If you do get a request to download the Microsoft Windows Installer software you can download it from here:

Windows Installer 2.0 for Windows 95, Windows 98, Windows Me
http://www.microsoft.com/downloads/details.aspx?familyid=cebbacd8-c094-4255-b702-de3bb768148f&displaylang=en

Windows Installer 3.1 for Windows 2000, Windows XP
http://www.microsoft.com/downloads/details.aspx?familyid=889482fc-5f56-4a38-b838-de776fd4138c&displaylang=en