I keep getting a message saying my protection engine has corrupted and that i should try re-installing live update. What is live update and how do i run it? - be grateful for any help

Hi,
I turn my i mac on and when it has loaded onto the home screen I get a message popping up saying my protection engine has corrupted and that i should try reinstalling live update and my computer will no longer be protected until I do so. Would anyone be able to tell me what live update is and how I would run/reinstall it? - be grateful for any help!!!
Thankyou

It would be a great idea to uninstall Norton - you don't need it and it has a pretty poor reputation for mucking up otherwise healthy Macs.
Have a look at this User Tip from klaus1: https://discussions.apple.com/docs/DOC-2435
To uninstall Norton:
https://support.norton.com/sp/en/us/home/current/solutions/kb20080427024142EN_En dUserProfile_en_us
Edit: To see whether you actually have Norton installed launch Activity Monitor in the Utilities folder. If it's installed you'll likely see some Norton entries there.
Also, in System Preferences>Users & Groups or Accounts, depending on OS)>Login Items, it might be listed.

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I keep getting a message saying my protection engine has corrupted and that i should try re-installing live update. What is live update and how do i run it? - be grateful for any help

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