You can remove instances of Microsoft® SQL Server™ 2000 by:
Each named instance of SQL Server 2000 must be removed separately. You cannot remove individual components of SQL Server 2000. To remove components, you must remove the entire instance.
Important Before removing SQL Server 2000, quit all applications, including the Windows NT Event Viewer, the Registry editor, all SQL Server applications, and all applications dependent on SQL Server.
To remove SQL Server using Control Panel
To remove instances of SQL Server using Setup