The setup routines for the Oracle ODBC client in instantclient64_12_1 could not be loaded. System error code 126: The denoted module was not found. (C:Program FilesOracleinstantclient64_12_1SQLORAS32.DLL).
Download and install the Microsoft Visual C++ 2010 Redistributable Package:
http://www.microsoft.com/en-us/download/confirmation.aspx?id=14632
The problem is not with the SQLORA dlls, but the modules that those ddls refer to (missing from a default Windows installation).
http://serverfault.com/questions/555972/cannot-create-oracle-odbc-source-on-64bit-windows-7