Assuming a Windows installation, do please refer to this:
http://www.oracle-base.com/articles/misc/ManualOracleUninstall.php
- Uninstall all Oracle components using the Oracle Universal Installer (OUI).
- Run regedit.exe and delete the HKEY_LOCAL_MACHINESOFTWAREORACLE 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_MACHINESYSTEMCurrentControlSetServicesOra* 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 FilesOracle" directory.
- Empty the contents of your "C:emp" directory.
- Empty your recycle bin.
Calling additional attention to some great comments that were left here:
- Be careful when following anything listed here (above or below), as doing so may remove or damage any other Oracle-installed products.
- For 64-bit Windows (x64), you need also to delete the
HKEY_LOCAL_MACHINESOFTWAREWow6432NodeORACLE key from the registry.
- Clean-up by removing any related shortcuts that were installed to the Start Menu.
- Clean-up environment variables:
- Consider removing
%ORACLE_HOME%.
- Remove any paths no longer needed from
%PATH%.
This set of instructions happens to match an almost identical process that I had reverse-engineered myself over the years after a few messed-up Oracle installs, and has almost always met the need.
Note that even if the OUI is no longer available or doesn't work, simply following the remaining steps should still be sufficient.
(Revision #7 reverted as to not misquote the original source, and to not remove credit to the other comments that contributed to the answer. Further edits are appreciated (and then please remove this comment), if a way can be found to maintain these considerations.)
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