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The solution lies in the following thread:
Windows 7 - ODBC for Office 2010 64 bit - MS ODBC Driver for Oracle
My operating system is Windows 7 64-bit, using Office 2010 64-bit. Trying to connect to an ODBC data source through Excel. The data source is an Oracle9i 32-bit database on a Windows Server 2003 32-bit server. However, the database version or server operating system is arbitrary; it could be an 8i, 9i, 10g, or even an 11g 32-bit or 64-bit database on a UNIX or Windows server. If you're using Windows 7 64-bit and you want to connect to an ODBC data source through Excel to an Oracle database, you must use Office 2010 64-bit. You cannot use Office 2003 or 2007, for example.
Follow these steps on your Windows 7 64-bit PC to connect to your ODBC data source.
1. Through Oracle's web site, go to Instant Client Downloads for Microsoft Windows (x64). Currently, the address to that page is:
2. Download the two following files, found under the version 18.104.22.168.0 heading:
Instant Client Package - Basic (instantclient-basic-win-x86-64-22.214.171.124.0.zip)
Instant Client Package - ODBC (instantclient-odbc-win-x86-64-126.96.36.199.0.zip)
3. Extract both zip files to the same directory (such as c:\oracle\instantclient_11_1).
4. Launch the Command Prompt (DOS command window) by running it as administrator. Go to Start > All Programs > Accessories, then right click Command Prompt and select Run as Administrator.
5. From within the Command Prompt, navigate to c:\oracle\instantclient_11_1, and run odbc_install.exe. You should receive a message saying Oracle ODBC Driver is installed successfully. The name of the new ODBC driver that was just installed is Oracle in instantclient11_1 -- use this driver when creating your ODBC connection.
6. Create a new system environment variable. Set the value of the variable name as TNS_ADMIN, and the value of the variable path as the directory that contains the tnsnames.ora and sqlnet.ora files. On my PC, I have another Oracle client already installed which has its own tnsnames.ora and sqlnet.ora files. Therefore, I set the value of variable path as c:\orant\net80\admin (the directory that contains my tnsnames.ora and sqlnet.ora files). If you don't have another Oracle client installed on your PC, create a new directory such as c:\oracle\instantclient_11_1\network\admin, and place the tnsnames.ora and sqlnet.ora files in that directory. Then, set c:\oracle\instantclient_11_1\network\admin as the value for the variable path.
7. To create the ODBC connection, go Start > Control Panel > Administrative Tools > Data Sources (ODBC). Alternatively, you can create the connection right from within Excel.
But now i have another problem.
The ODBC connection is now throwing this error message:
Unable to connect+
+*[Oracle][ODBC][Ora]ORA-03134: Connections to this server version are no longer supported.*+
The installed client version is 11 on a 64 bit machine and trying to access an Oracle instance of 8.
No clue as what the problem could be.
Edited by: user647126 on Mar 29, 2011 4:22 PM
A Oracle 11g client cannot connect to an Oracle 8i server. It clearly stated in the Oracle version compatibility matrix.
8i client can connect to any server from 7.3.4 to 11g
9iR1 client can connect to any server from 7.3.4 to 11g
9iR2 client can connect to any server from 8.1.7 to 11g
10g client can connect to any server from 8.1.7 to 11g (with some sub version not supported)
11g client can connect to any server from 9iR2 to 11g
11g client can only connect to 9ir2 onwards and hence the error.