Vista - Silent Installation of an msi installer file.

Hi All,

I have a product to install say "xyz.msi" - This is msi installer
file.
I need to do a silent installation on MS Window Vista Enterprise
machine.
I am asked to use the command
{
msiexec /qn /i "xyz.msi"
}

This installation need to be done by logging in to the machine as
elevated administrator (User with a member of Admin group membership)
as well as a Standard user (non admin user).

UAC is enabled and all its corresponding settings are at its default
level.

Product is not getting installed at all ( i think it need admin rights
to overcome the UAC dialog)..

Now, I elevate my command prompt to an administrator using run as
administrator option (Manually) and try to install the product - It
gets installed successfully.

----This is way to do silent installation on MS Vista platform (Is
this the functionality?).

---From Dev point of view is it possible to instanciate a command
prompt with admin previlage automatically......


How my requirement is to do a silent installation using an SMS server
through out an enterprise?

I need to deploy this package automtically to all vista machies
available on my enterprise.

How to do the installation? what should I do to do this task?
My question is "Is this task a valid scenario?".


Thanks,