1 Visit the Norton site. Go to http://norton.com/setup and click “Enter a product key” if you are a new user or click “Sign in” if you already have a Norton account. 2 Welcome to Norton. Enter your information and click “Create account”. 3 Norton Setup. Enter your 25-character software key from your order confirmation email. 4 Cancel automatic renewals. If you are asked about Automatic Renewal press “Cancel”. 5 Select “Agree and Download”. Norton installation. You can now start the installation. You can proceed from step 6 here (installation guide).