You may face this error while you try to activate your Norton product that you have already installed on various devices from norton.com/setup. Activation can be performed automatically or manually. You can manually enter your product/activation key to activate your product when the popup appears on your screen. You will find this product key in your registered email address while performing Norton setup.Once you visit the website, you can login to your Norton account to Download, Install or Reinstall Norton antivirus. You can setup your Norton account with 3 simple steps:Visit on Norton.com/setupClick on ‘Get Started’You will get an option to enter your ‘Product key’ hereIn case you face problem while installing Norton, then visit the official site and know how to install Norton setup on your device.