ADO Database Delphi

Question:
"Interface mismatch. Engine version different" error:
This error occurs when I start my Delphi 3 application.
What is wrong?
Answer:
All Delphi 3 database applications require that BDE 4.0 or
greater is on the system. If you distribute this type of
application, you must also distribute BDE version 4.0 or
greater.