Modern operating systems include powerful, built-in security. Windows Security (formerly Windows Defender) provides robust, real-time protection, firewalls, and behavioral analysis out of the box without slowing down the PC.
If you are looking for security software, it is safer to use:
If you specifically prefer the Norton interface, the official website provides legitimate, safe trial periods for their modern Norton 360 tracks, which include updated cloud backups, VPNs, and dark web monitoring.