http://download.microsoft.com/download/WindowsInstaller/Install/2.0/NT45/EN-US/InstMsiW.exe
Windows Installer 2.0 Redistributable for Windows NT 4.0 and 2000 supports Windows NT 4.0 with Service Pack 6 or later and Windows 2000. Windows XP contains Windows Installer 2.0 and therefore can't be installed or upgraded by this redistributable.
For Windows 95, 98 and ME see "Windows Installer 2.0 Redistributable for Windows 9X", available at http://www.microsoft.com/downloads/release.asp?ReleaseID=32831
Operating System - Windows NT 4.0 & 2000