ODBC Administrator Can't Find Oracle TNS Names File

Question

With a new Oracle Installation when I go to Configuration Management Tools > Microsoft ODBC Administrator > System DSN > Add > [new installation] it doe

Answer 1

Sorry to revive an ancient thread, but I had the same problem, and Net Configuration Assistant wouldn't run.

(Windows XP SP3, Oracle 11gR2 client)

SOLUTION:
1. Uninstall all other Oracle_Home instances using the Oracle (De-)Installer (don't just go deleting registry keys!), so that you only have the one Oracle_Home that you want to keep:
%oracle-home-that-you-want-to-keep%\client\oui\bin\setup.exe
2. Create or set Windows environment variables:
TNS_Admin = %oracle_home%\client_1\network\admin
Path = %oracle_home%\client_1; ...
3. Reboot. (sigh...)

Anyway, that's what worked for me.