http://www.microsoft.com/technet/WindowsVista/library/ops/4bbbeaa0-f7d6-4816-8a3a-43242d71d536.mspx?mfr=true

This step-by-step guide uses a sample device and driver to demonstrate how to securely deliver device driver packages to client computers in a lab environment so that a standard user can install them without any assistance from an administrator or user interface prompts.