Norton.com/setup - Norton Antivirus is a security software program that helps in protecting your computer. It prevents viruses, spyware, malware infection by entering and causing harm to your device. What is a Norton setup Product key ? Norton setup product key is 25 characters alphanumeric unique string which is used to activate a Norton setup. Without redeeming the product key you can not download your Norton setup. How do I find Norton on my computer? To find out if you already have Norton virus protection free software: Open Action Center by clicking the Start button , clicking Control Panel, and then, under System and Security, clicking Review your computerâ€™s status. Click the arrow button next to Security to expand the section.