Background:

My machine is installed Oracle client 11.2,but some commands are missing. maybe it's not installed properly due to the installation type (Administrator,Custom,others... ) during prevIoUs installation.

SO,when I try to use the "Deinstall" which is in the installer. but it's not working.

Then,I tried to delete the oracle home manually : C:\Oracle .If it's not be able to removed,try to restart the machine)

before removing,copy out C:\app\dingl\product\11.2.0\client_1\network\admin\tnsnames.ora

then check registry and delete relevant entries. but for my case,no oracle register entry was found.

Just try to install,choose "Administrator" and continue. Everything is fine after the installation.