Obtaining an ODBC link to an Oracle 9.2 database via Instant Client

Hi
Justin Cave, on one of your other forums, has been assisting but as of yet we have not suceeded. He suggested that this forum may be of help.
We are trying to find a way of linking a Microsoft Access database to an Oracle 9.2 database but as of yet have not suceeded can you please help?
The database server we are trying to connect to has a full installation of Oracle 9.2. We have a limited number of workstations that have a fully licensed Oracle client installation (required to use our PDM system). On these workstations we can successfully configure an ODBC connection to the Oracle database on the server and link tables in MS Access. However the majority of our PCs do not have any Oracle client installed, nor do we have any further Oracle client licenses to install with (we do have the installation media for both the server and client software).
We have attempted to use Orcale Instant Client (and ODBC addon) believing that we do not need licenses for this, at both the latest version 11.1.0.70 and at the earliest version we could find 10.1.0.5 but neither was successful in making an ODBC connection to the Oracle 9.2 database. Is this because we are using the wrong version of the Instant Client or is it just because we cannot configure it correctly? Are we correct in believing that we do not need to purchase licenses for Instant Client?
If we are way off the mark, what can you suggest?
Many thanks in advance.
Kevin (and co)

Hi Laurenz,
Firstly, thank you for your prompt response.
Secondly, in answer to some of your questions:
1. How did you install Instant Client? By extracting the downloaded package to a directory on the local HDD (C:) maintaining the subfolder structure.
2. What environment variables did you set? We set TNS_ADMIN using the System Properties Dialog (Environment Variables) to be the folder where Instant Client was installed to (extracted to) i.e. C:\InstantClient_11_1. We also amended the PATH to include this folder using a command prompt and typing PATH=%PATH%;C:\InstantClient_11_1. This works but only until the next reboot when the PATH reverts to the previous value.
3. Did you run the odbc_install script to install the ODBC driver? Yes, we extracted the ODBC add-on into the same folder and ran the ODBC_install.exe script successfully.
4. Does the driver show up in the list of drivers on your system? Yes.
5. Do you get any error messages? When we use v11.1.0.70 and hit the test connection button within ODBC admin, we get a noticiable delay followed by 'Unable to connect... TNS could not resolve the connect identifier'. When we use v10.1.0.5 we cannot even complete the System DSN ODBC configuration.
Our next questions are as follows:
1. Is the TNS_ADMIN environment variable case sensitive and should it have a \ after the folder name?
2. How do we amend the PATH permanently, so it does not revert following reboot?
3. What part does tnsnames.ora play in the configuration. This file currently resides deep within the folder structure on the database server. Should we be copying it to the local C: and placing it in the same folder as Instant Client?
Once again, many thanks for your help.
Yours,
Kevin (and co)

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