Application runs but not as a Windows service oracore

I have a weird problem and I was hoping somebody might be able to help me. I have an application that we developed that uses an Oracle database. The application can be run in user mode(double clicking on the file) or as a Windows service. We have always used the Oracle Database client to connect to the Database in user mode and it has worked. Using the same configuration we were able to run our application as a service and it has always worked. The problem now is that if we use a newer Oracle Client (>= 10.2) it will not work as a service. When I say it doesn't work I mean that the application never starts and the Windows Event Viewer log states an APPCRASH in oracore10.dll or oracore11.dll.
It doesn't seem to matter which database we use, 10G, 11G, because if we use the 10.1 version of the Oracle Database Client to connect to these databases it works. However if we use any client>=10.2 the application crashes.
Any suggestions?
Edited by: 945875 on Jul 11, 2012 1:45 PM

So I stopped any Oracle windows services that were running, deleted the only oracle directory on the machine, and reinstalled 11.2 client. The same results occur, I can connect to and start my application in user mode but not as a service. I checked the version# of OCI.dll, 1 instance of it on the machine, and it does state that it is version 11.2.0.1. The setup I have is:
Machine 1: Server 2008 R2
Oracle 11g database
Oracle 11g client
my application
Machine 2: Windows 7 64-bit
Oracle 11g client
my application
I get the exact same results if I try to run my application on the same machine as the database (machine 1) or across the network (machine 2).
I've setup the connection using Oracle Client's Net Configuration Assistant, added the Local Net Service Name Configuration, and am using TCP. At the end of the Local Net Service Name Configuration I get "Success" when talking to the database.
Thank you for any help you might be able to provide.

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