New Vista setup, Network on Public and not Private?

All,

Just set up a new Vista machine Home Edition. Anyways, whenever I restart
the computer, by default it goes to 'Public' and not 'Private'. So, I would
have to manually click on the big red X mark in Network and Sharing Center,
click Diagnose and finally I am able to go on when it sets itself to
Private. But if I reboot, it would go back to PUBLIC with 'unidentified
network'. How do I automatically
set it Private?
I read that its because I am in computer admin mode and not this super
admin. What can I do?

Thanks!