Mixed mode security on XP

Hi,
I am trying to get a demo going on an XP laptop.
To do this I am trying to set Authentication on the server Security tb to
"SQL Server and Windows".
Changing this setting is not sticking. IE I make the change, click OK, check
and the change is gone. If I restart SQL Server, the change is not there.
HELP!
TIA
-TimWhoops. I did not have SP3a in...
"Mercury" <me@.spam.com> wrote in message
news:d3dhcp$i08$1@.lust.ihug.co.nz...
> Hi,
> I am trying to get a demo going on an XP laptop.
> To do this I am trying to set Authentication on the server Security tb to
> "SQL Server and Windows".
> Changing this setting is not sticking. IE I make the change, click OK,
> check and the change is gone. If I restart SQL Server, the change is not
> there.
> HELP!
> TIA
> -Tim
>