Delphi5 ADO connection problem

We had a Windows server running a Virtual Campus developed on Delphi5, MSSQL Server and ADO DB connections. The server broke up and we moved the systems to a new server, but after installing everything, there is a problem with the connection to the database. Campus is compiled, using ADO DB connections with Delphi components. When you access the site, you get the following error message: Exception: EOleException Message: Connection Error I need someone to solve the problem. I think it should be easy, and no more than 2 hours work. Server is installed in Spanish.