Problems to install the Natural One

Hi. I am with problems to install the natural one. I try to install but it stay in waiting for many time. so i stoped with it. I uninstalled the Natural One with sucessfull, but now when i Try reinstall a message says : “An error occured during creation and start of the database. As a result the Adabas demo database 12 cannot be used.” Failed to create database with ID 12. Internal error 1. I don´t now what to do.