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Uninstall Oracle DB on Windows completely


  1. START -> RUN -> Services.msc
  2. Locate all Ora* services & click on STOP
  3. Start -> RUN -> Regedit
  4. Locate HKEY_LOCAL_MACHINE folder in the registry
  5. Open Software folder
  6. Delete the Oracle folder under Software
  7. Open System folder in HKEY_LOCAL_MACHINE
  8. Open CurrentControlSet folder within the System folder
  9. Open Services
  10. Delete all keys related to Oracle. Every key starts with “ORA..”
  11. Close the regedit
  12. Delete ORACLE_HOME folder
  13. Delete the Oracle folder in Program Files
  14. Reboot

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

  1. Delete the HKEY_LOCAL_MACHINE/SOFTWARE/ORACLE (and HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\ORACLE on 64bit) key which contains registry entries for all Oracle products by using regedit.
  2. Delete any references to Oracle services/components in the following registry location: HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Services/. Looks for key entries that starts with “Ora” which are obviously related to Oracle.
  3. Reboot the workstation.
  4. Delete the ORACLE_BASE directory. (i.e C:\Oracle)
  5. Delete the directory C:\Program Files\Oracle.
  6. Empty the temp directory.
  7. Empty the recycle bin.
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