Unable to Load DLL (oci.dll)

I am trying to connect to Oracle 10g database using Visual Studio.Net 2003, System.Data.OracleClient namespace. I have created a Web service running on my workstation's local web server, that uses a connection to an Oracle database (my connctionString="Data Source=orcl;User Id=myid;Password=pswd" ). While the program trying to execute myConnection.Open() - it is receiving the error "Unable to load dll (oci.dll)". I have installed the Oracle client on a development (WinXPPro) workstation, so the client BIN directory is visible, production server is running Oracle 10g on Windows 2003.
Is it some kind of connection string issue or user permission problem? How do I setup the right ones?
Thanks for the help in advance!!

Hi Justin,
Thanks for your response.
Yes, I can connect to the database using both Aqua Data Studio or SQL *Plus. I even can connect to the database from Visual Studio utilizing Data Link Properties utility via OLE DB drivers either from Microsoft or Oracle. The credantials I am providing in the last case are the same as I use in my connection string: data source name (tnsname) - orcl, user id and password...

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