Try going into c:windowssystem32odbcad32.exe and make sure that ODBC data soucre is labeled the same.
<i>…isn’t that automatically installed if he has Client Access.</i>
Except for maybe the base “required” components, very little useful components are “automatically” installed. None of the data transfer components, and not even Navigator, are “automatically” installed. That is, they may be generally selected by default (assuming it wasn’t a silent install) and they may be deselected by accident or on purpose.