Business Notifications with Nav 4.0 SP1

I currently have a license version of Nav 4.0 SP1 installed on Window 2003 SP1, SQL 2000 SP4. I have been trying to add the Navision Business Notification interfaces for use with Navision but I continue to get a SQL NS registration failed error when installing. I have created several instances to use with my domain admin account but the services will not start. Each time I try to install Business Notification this error occurs. I have followed the instruction of installing Business Notification Server and have all of the prerequisites on the server. Can anyone help me in case I missed a step for this installation