Discoverer throwing ORA-02248 at logon

Before I get started, I know that the version of Discoverer I am trying to use is not supported. I do not care, I am only trying to bridge the gap until our new solution is in place.
On to the question....
I have been able to successfully install Discoverer Desktop 9.0.4.43.17 on a Windows 7 x86 client machine.
I am using a known good tnsnames.ora file from a WinXP SP3 machine running the exact same Discoverer build (which works perfectly).
I know the Discoverer install works with the Windows 7 machine as I can run the sample data without a problem.
When I try to connect to the database, I get a ORA-02248: invalid option for ALTER SESSION.
The database parameter is AMERICAN_AMERICA.WE8MSWIN1252.
I have ensured that the registry setting matches this. I also tried to create a system variable - NLS_LANG - that matches this.
Nothing works. I know there is most likely a very simple fix for this, but I cannot figure it out. Somebody out there has got to be running Discoverer Desktop on Window 7 x86 clients and know what needs to be done.
ANY help is greatly appreciated as we want to get rid of XP once and for all!
Mike

This is a standalone install trying to connect to a database account.
This error occurs with any account.
Item of interest: If I login incorrectly, I get an access denied / invalid user account/password message. This tells me that the connection is there.
Edited by: 794182 on Apr 30, 2012 10:31 AM

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