After you install Snow Leopard, your Mac will go through its first restart and then either bring you to a login screen or directly to your desktop. Once you reach the desktop, there will be a short wait as Snow Leopard performs a few background tasks and then launches the Max OS X Setup Assistant.
Setup Assistant
The Max OS X Setup Assistant will display its welcome screen and play a bit of music. Once the welcome animation is over, the Setup Assistant actually has nothing to do, because you upgraded from a previous version of OS X and there’s nothing more to set up. You can click the ‘Continue’ button and start exploring your new installation of Snow Leopard.
