Reinstall Norton Antivirus Latest Version then, you should install the latest version of your laptop or desktop :

1. Open a web browser on your computer.
2. Go to norton.com/setup and Sign In with your Norton account credentials.
3. Head to the Norton Download link on the Get Started
4. Hit the Agree and Download link.
5. Once that done, tap the Save button on your web browser.
6. When the download completes, just launch the program installer file and then follow on-screen instructions to install the program.