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Install first Oracle Instant client Basic 

Install ODBC

Install Tools package.

Source:https://docs.oracle.com/cd/B28359_01/install.111/b32007/deinstall.htm#CIHCJBFE

5.3 Manually Removing the Remaining Oracle Database Client Components

Oracle Universal Installer does not remove all Oracle components. After using Oracle Universal Installer to remove Oracle components, you need to manually remove remaining registry keys, environment variables, Start menu options, and directories.

This section contains these topics:

Note:

In rare situations, you might want to correct serious system problems by completely removing Oracle components manually from the computer without first deinstalling with Oracle Universal Installer. Do this only as a last resort, and only if you want to remove all Oracle components from your system.

5.3.1 Updating the PATH Environment Variable Path

Check the PATH environment variable and remove any Oracle entries.

  1. Display System in the Control Panel.

  2. Select the Advanced tab and then click Environment Variables.

  3. Select the system variable PATH and edit it to remove any Oracle entries.

    For example, remove Oracle entries that contain ORACLE_BASE\ORACLE_HOME in the PATH variable. You may see a PATH variable that contains entries similar to the following:

    ORACLE_BASE\ORACLE_HOME\bin;ORACLE_BASE\ORACLE_HOME\jre\1.4.2\bin\client;
    ORACLE_BASE\ORACLE_HOME\jre\1.4.2\bin
    
  4. Save any changes and exit System.

5.3.2 Removing Oracle Database Client from the Start Menu

Check the Start menu for any Oracle Database Client entries and remove them.

Follow these steps:

  1. Select Start, then Programs, then Oracle - HOME_NAME.

  2. Right-click Oracle - HOME_NAME, and from the menu, select Delete.

You can also remove Oracle Database Client menu entries by using the following method:

  1. Right click the Start button to display the pop-up menu.

  2. Select the Explore All Users option.

  3. Under Documents and Settings, expand the \Start Menu\Programs folder.

  4. Right-click and delete the Oracle - HOME_NAME folder.

5.3.3 Removing Oracle Database Client Directories

After removing all Oracle Database Client registry keys and restarting the computer, delete any existing Oracle Database Client directories and files.

  1. Using My Computer or Windows Explorer, delete the SYSTEM_DRIVE:\program files\oracle directory.

  2. Using My Computer or Windows Explorer, delete all ORACLE_BASE directories on your hard drive.