System DSN not showing up in Crystal 11 Designer

We have a new installation of Crystal reports v 11 on a 2003 windows (64 bit) web server. When I open an existing report for editing in the designer app and try to set the database location, the system ODBC's do not show in the selection window.

We have re-installed the application twice. The system DSN was created under an administrator but the designer app still doesn't see it. I've been able to create a file DSN which does show up in connection selection window.

Any help on this would be much appreciated.

Thanks in advance.