This will remove all Oracle products, Oracle services, and Oracle registry entries from your computer.

Complete the following steps to create a Clean Machine.

Backup any relevant databases before proceeding!

On Windows 95 and Windows 98:

1. Ensure you shutdown your Oracle.  Right click on the Oracle Icon in the toolbar and click on the shutdown option.

2. Un-install all your Oracle products if possible.  Use universal installer to do that.  Ignore this step if you don’t have universal installer on your machine or have problem to do that.

3. In regedit, go to HKEY_LOCAL_MACHINE\SOFTWARE\ORACLE.

4. Delete the ORACLE key.

5. Edit your AUTOEXEC.BAT file and remove your %ORACLE_HOME%\bin and JRE paths from the path setting.

6. From the Windows Explorer (or from the command prompt), delete the Oracle directory (Oracle Base).

7. Delete <system_drive>:\Program Files\Oracle (from the Windows Explorer or from the command prompt).

8. Delete Icons from <system_drive>: \Windows\Start Menu\Programs\Oracle - <HOME> and <system_drive>:\Windows\StartMenu\Programs\Oracle Installation Products. Where <HOME> is the previous HOME name.

9. Reboot your computer.

On Windows NT:

1. Ensure you are logged in as a user with Administrator privileges.

2. Stop all Oracle Services through Control Panel Services.  Use universal installer to un-install your Oracle products.  Ignore un-install if you don’t have universal installer on your machine.

3. Using regedit (at the command prompt, type regedit), go to HKEY_LOCAL_MACHINE\SOFTWARE\ORACLE and delete the ORACLE key.

4. Open HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services, and remove all keys under HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services that begin with ORACLE.

5. Open HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\EventLog\Application, and remove all keys under HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\EventLog\Application that begin with ORACLE.

6. Close regedit.

7. From the Control Panel, open System.

8. If JRE was installed by Oracle, remove the %ORACLE_HOME%\BIN path and the JRE path. For example, you may see a path similar to this one: C:\ORACLE\ORA81\BIN;G: \Program Files\Oracle\jre\1.1.7\bin. Go to Start > Control Panel > System > Environment tab. Click on the system variable path and modify the path.

9. Delete Icons from <system_drive>:\Winnt\Profiles\All Users\Start Menu\Programs\Oracle - <HOME> and <system_drive>:\Winnt\Profiles\All Users\Start Menu\Programs\Oracle Installation Products. Where <HOME> is the previous HOME name.

10. Delete <system_drive>:\Program Files\Oracle (from the Windows NT Explorer or from the command prompt).

11. Reboot your computer.

12. Delete all ORACLE_BASE directories (You can find the Oracle homes listed in HKEY_LOCAL_MACHINE\SOFTWARE\ORACLE\ORACLE_HOMES).