Does anyone know what I should do?
It's looking for the original installation source. If you deleted that, that's probably the reason.
To Diagnose and Fix installation problems automatically, please see the new Microsoft tool for this here:
For more information on the Autodesk KB Support article concerning the clean uninstall of Autodesk products, see this link:
For all other installation problems on Windows XP SP2 or below consider using the Microsoft Installer Clean Up Utility. For more information on this program, please my forum post here:
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