* Uninstall all Oracle components using the Oracle Universal Installer (OUI). * Run regedit.exe and delete the HKEY_LOCAL_MACHINE/SOFTWARE/ORACLE key. This contains registry entires for all Oracle products. * Delete any references to Oracle services left behind in the following part of the registry: HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Services/Ora* It should be pretty obvious which ones relate to Oracle. * Reboot your machine. * Delete the "C:\Oracle" directory, or whatever directory is your ORACLE_BASE. * Delete the "C:\Program Files\Oracle" directory. * Empty the contents of your "c:\temp" directory. * Empty your recycle bin.
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