Either use SQL Server Configuration Manager or the "Services" windows applet.

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Tibor Karaszi, SQL Server MVP
http://www.karaszi.com/sqlserver/default.asp
http://sqlblog.com/blogs/tibor_karaszi
> Is there a way to disable SQL server 2005 from starting up automatically in
> Vista? It is not listed in startup tab in MSCONFIG or on any option
> screen.. But the database always loads upon bootup.. I want to start it
> manually only.. how do i do this?
>
> thanks!