Uninstalling all Oracle products from Windows manually, when oracle default uninstallation fails

Posted: April 30, 2011 in Computer Tips & Tricks

During the Oracle Installation process, any installation/sytem error  or sudden power failures causes Incomplete Installation. The Operating System does not allows us to either reinstall the Oracle product or uninstall the existing Oracle components. Here is a procedure to Uninstall all the Oracle components manually, when Installation Failure occurs.

Uninstall all Oracle components

  1.  Run regedit.exe and delete the HKEY_LOCAL_MACHINE/SOFTWARE/ORACLE key. This contains registry entries for    all     Oracle products.
  2. Delete any references to Oracle services left behind in the following part of the registry:HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Services/Ora*
  3. It should be pretty obvious which ones relate to Oracle.
  4. Reboot your machine.
  5. Delete the “C:\Oracle” directory, or whatever directory is your ORACLE_BASE.
  6. Delete the “C:\Program Files\Oracle” directory.
  7. Empty the contents of your “c:\temp” directory.
  8. Empty your recycle bin.

At this point your machine will be as clean of Oracle components as it can be without a complete OS reinstall.

Remember, manually editing your registry can be very destructive and force an OS reinstall so only do it as a last resort else before making any changes in REGISTRY export its settings so that any they can be imported if any errors occur.

I am also attaching the PDF file which explains the step by step procedure to Uninstall all Oracle products from Windows

Uninstalling all Oracle products from Windows systems

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