You can remove Microsoft® SQL Server™ from your computer using any of these methods:
For more information about Sql70rem.bat, see Unattended Installation.
Important Before removing SQL Server, shut down all applications, including the Windows NT Event Viewer, the Registry editor, all SQL Server applications, and all applications dependent on SQL Server.
Note You may need to delete the \Mssql7 directory manually after SQL Server is uninstalled.
To remove SQL Server