Removing Oracle9i and reinstalling it

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Did you uninstall the Oracle software using the Oracle Universal Installer? When using the OUI, it will generally clean up all required registry entries for you. If you want to remove the Oracle software manually, there is a very good article on Metalink (Doc ID #124353.1) which describes in detail how to manually remove Oracle components on the Windows platform. At a high level, the steps you need to take to uninstall Oracle are as follows:

• Ensure you are logged in as a user with Administrator privileges.
• Stop all Oracle services (if any are running).
• If possible, remove the Oracle software by invoking the Oracle Universal Installer (OUI) and remove the software.
• Remove the entries in the Windows registry.
• Clean up environment settings.
• If you could not use the OUI to uninstall the software, delete the software and icons at this point.
• Empty the recycle bin.

One word of caution is to be very careful editing registry entries.