See Also
Use the Installation Type page of the SQL Server Installation Wizard to specify whether to install a new instance of SQL Server 2008, or add features to an existing instance.
Options
Select the radio button that specifies your choice:
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Perform a new installation of SQL Server 2008
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Add features to an existing instance of SQL Server 2008
If you select the option to add features to an existing instance, use the drop-down list to select the instance of SQL Server to update.
Note: You cannot add features to a failover cluster instance after it has been installed. To add SQL Server features to an existing failover cluster, you must perform a new installation to install a separate instance of SQL Server.