Manually Uninstalling Oracle in Windows

  • Uninstall all Oracle components using the Oracle Universal Installer (OUI).
  • Run regedit 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.
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