Java Runtime Environment (JRE) version 1.3.1_03, 1.3.1_04, 1.4.0_01, 1.4.0_02, or 1.4.0_03 has been detected on your system.

You must uninstall this JRE (using your Control Panel's Add/Remove Programs functionality) in order to continue with the ArcIMS 4.x Viewer or Manager install.