Vista Premium to Join domain

Hi,

I would like to ask for some help with Windows Vista Premium and the impossibility to join a Domain.

I am following the steps in the “guide to secure wireless networking” to enable RADIUS on server 2003 using AD.

My problem is that I would like to join one of my clients to the Domain but it seems pretty dificult because Vista Premium according to Microsoft is a dedicated multimedia centre for home users and does not have the services for joining a Domain.

Would be possible some help pls?

Regards