WhatsUp Gold requires a database to store information about the devices it monitors. By default, WhatsUp Gold installs and configures SQL Server 2005 Express Edition to use as its data store. WhatsUp Gold also supports using Microsoft SQL Server 2005 installed either on the same computer as WhatsUp Gold or on a separate computer.
If you want to use SQL Server 2005 installation to host the WhatsUp Gold database, you must complete the WhatsUp Gold installation and then migrate the WhatsUp database to your SQL instance.