Thanks for the reply.

There was no network folder in the instant client dir. I have created network\admin and copied the tnsnames.ora file from the oracle server and created the TNS_ADMIN system variable to that path.

I was under the impression (probably mistakenly) that all I need to install to obtain ODBC access was the
instant client (instantclient-basic-win32-10.2.0.3-20061115.zip (34,469,920 bytes))

and

the ODBC driver package (instantclient-odbc-win32-10.2.0.3-20061115.zip (722,911 bytes)) from the Oracle Instant Client Downloads section.

The only Oracle driver I can currently see is the Microsoft one for Oracle, thats what gives me the error.

Add/remove programs does not show oracle driver and network components installed..

Assuming I am missing an install set can you point me in the direction of the download I will need?

Many thanks again