The Registry Rebuild option on the Advanced Options Setup screen allows you to rebuild the registry for a corrupted Microsoft® SQL Server™ installation. This process fixes only the registry; it does not fix data errors or the master database.
Important To rebuild the registry, you must enter setup information using the same choices that you entered during the initial installation. If you do not know or are not sure of this information, do not use this registry rebuild process. To restore the registry, you must uninstall and reinstall SQL Server.
To rebuild the registry