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Creating a new Oracle Shared Datasource from Visual Studio 2005 client

I'm running Win7x64 with Oracle client. I can connect to the particular instance using TNSNAMES.ora fine from: Sqlplus and Toad. When I try to create a new DataSource in VS2005, I get the ORA-12154.

I tried the following:

1. Added WRITE security on ORACLE_HOME folder.
3. Created another TNSNAMES entry with FQDN as #2 above.

I also downloaded: ODTwithODAC1020221.exe but when I installed, I received the following:

Starting Oracle Universal Installer...

Checking installer requirements...

Checking operating system version: must be  4.0, 5.0, 5.1, 5.2 or 6.0 .    Actua
l 6.1
                                      Failed <<<<

Exiting Oracle Universal Installer, log for this session can be found at C:\Prog
ram Files (x86)\Oracle\Inventory\logs\installActions2011-05-17_12-00-48PM.log

Please press Enter to exit...

Oracle Database.NET ProgrammingInstallation

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8/22/2022 - Mon