Setup User Interface Reference
This section describes the installation options presented by the Microsoft SQL Server Installation Wizard. Options include installing SQL Server 2005 components or upgrading an existing SQL Server instance to SQL Server 2005.
Changing or removing an existing SQL Server 2005 instance is provided through Add or Remove Programs in Control Panel. For more information on instance maintenance, see How to: Change Components in an Existing Instance of SQL Server 2005 (Setup). For more information on instance removal, see How to: Uninstall an Existing Instance of SQL Server 2005 (Setup).