Oracle and Delphi -Ora-12203

I'd like to connect an Oracle table with Delphi 2 c/s. But I get the
message ORA-12203. I use NT 3.51.
There is a path in my environment to ORANT/BIN (it's not on my
computer)-before I got a message: Vendor initialization bla,bla...
In DBE I set protocol to TNS (before it was TCP/IP).

What else should I do?

!!!If I could pass the BDE, it would be great, too.!!!

Thanks for any suggestion,

Bozo Kralj