Starting a software program that was installed with Windows Installer Version 1.0, such as Office 2000, returns a prompt for the install source.
ArcGIS setup uses Windows Installer 1.1. Updating the installer may result in this behavior with previously installed software packages.
Obtain access to the installation source of the application. Once the application opens successfully, access to the installation source is not required.
For Office 2000 applications, install the Office 2000 SR1a (Service Release)