You've just upgraded the default instance from SQL 2000 to SQL 2005. If you need the default instance as SQL 2000 you'll need to uninstall SQL 2005 then reinstall 2000. Then restore the databases from the most recent SQL 2000 backups. Then you can install SQL 2005 as a named instance.
Last Wiki Answer Submitted: September 9, 2010 11:52 pm by Denny Cherry64,550 pts.