Windows Server 2008 R2 64 bit machine requires clean deinstallation of Oracle database 11g 32 bit client to be uninstalled.
Due to corrupted Oracle Client Installation clean deinstall and re-install is required.
1. Find ODBC Data Source Administration Program for 32 bit in a 64 Bit Windows OS
In a 64 bit Windows machine the default ODBC Administrator contains drivers from only 64 bit Software.
So if we install 32 bit Oracle Client Software it will not be shown as a valid driver in User DSN and System DSN in the default ODBC Administrator.
The 32 bit driver is avilable in the 32 bit version of the ODBC Administrator.
32 bit version of ODBC Administrator in Windows Server 2008 R2 64 bit Os can be found in the following location:
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