For a 64-bit app using SQL Server ODBC Driver 17:
Permissions: Windows 7 is strict about registry permissions. Ensure you are running the ODBC Administrator as an Administrator when creating System DSNs. 64 bit odbc driver windows 7
The 64-bit ODBC Administrator is located in System32 , not SysWOW64 – the opposite of what many expect. For a 64-bit app using SQL Server ODBC