By default when you are installing the demo database by the installation program you can only install one Demo Database. But if you would like to have more than one Demo Database to try different things in, how to accomplish that? I assume that you know that you can create a new company in the classic client, but you will then not get the demo data. The solution is simple to use SQL Server Management Studio to attach more than one version of the Demo Database.
How do i stop the SQL server?
Go to the SQL Server Configuration Manager under Configuration Tools from the Programs menu. Once open, click on SQL Server Services on the left hand pane. You will have a SQL Server (MSSQLSERVER) on the right hand pane. Right click and Stop.