After finishing the Setup Wizard (Step 3), a progress bar will be displayed as the required files are downloaded to your computer. This may take a while. The computer will restart automatically.
After the computer restarts, it will enter Setup and begin the process of upgrading your computer to Windows 7. It will look like this:
From this point on, the setup program will take care of the rest. Feel free to leave your computer and do something else. Just remember not to unplug your computer or close the lid of your laptop. After 2-4 hours, your computer will be finished upgrading and you can begin using Windows 7!