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While attempting to install ArcGIS Desktop 8.x the following error is returned:
"Internal Error 2103: Please contact product support for assistance."
The following registry key is missing or damaged:
Download and install the latest Windows Installer and rerun the installation. If that does not resolve the error, see below.
Warning: The instructions below include making changes to essential parts of your operating system. It is recommended that you backup your operating system and files, including the registry, before proceeding. Consult with a qualified computer systems professional, if necessary. Esri cannot guarantee results from incorrect modifications while following these instructions; therefore, use caution and proceed at your own risk.
C:\Documents and Settings\All Users\Start Menu\Programs\Startup