Because Toad does not support 64-bit Oracle clients, you will uninstall the client that is already installed
Official website Uninstall Instructions:
Http://docs.oracle.com/cd/E11882_01/install.112/e10844/deinstall.htm#BABHIGFE
Website download Oracle Uninstall Tool:
Http://www.oracle.com/technetwork/database/enterprise-edition/downloads/index.html
Under Oracle Database 11g Release 2, click [All], and then see the deinstall download link in the open page
Download the appropriate uninstall tool from the website (or find the Deinstall directory under the installed Oracle_home directory, which has the uninstall tool deinstall)
Deinstall-home D:\oracle\11.2.0\client
Deinstall-home D:\oracle\product\11.2.0\client_1
During the uninstall process select Yes (or add other parameters, let him uninstall the Oracle, specific parameters reference website)
Note: Different versions of the uninstall tools and methods are not the same, the following is the oracle8.1.7 uninstall way, from the installation file to find the install directory under the Oui.exe, or use Setup.exe to try
D:\Downloads\win64_11gR2_client\client\install\oui.exe-silent-deinstall oracle_home={"D:/oracle/11.2.0/client"}
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