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ODP.NET, Unmanaged Driver uses unmanaged dependencies in the Oracle Client. The error you see means you have another Oracle Client installed on the Win2003 machine and ODP.NET is attempting to load the incorrect Oracle Client version, rather than the version you installed ODP.NET with.
What you need to do is direct ODP.NET where to find the correct version of its unamanaged Oracle Client dependencies. This will be generally the bin directory of your Oracle Client home that was installed with ODP.NET.
You can learn more about DllPath here:
If you're not familiar with how to set ODP.NET settings in the Registry or .NET config files, you can read how to do that here: