Firstly I'd like add that other anti virus programs are available, these are just my personal thoughts on these programs based upon my experience whilst using them, individual users may experience a better or worse experience,
I dropped Norton, McCafee, Avast and most of the other anti-virus programs due to them being very 'resource hungry',
Norton actually slowed down my Laptop, (which was running an Intel Pentium i5 processor, and 8gb of RAM ) and I ended up getting sick of constant pop ups from Avast, which seemed to like telling me to purchase various add - on programs.
CHEERS CHRIS for the info
chris
(And I might add, both of these programs missed some pretty serious and nasty malware that was doing the rounds a couple of years ago.)
In the end I went with 'Total AV',
This was originally a free anti-virus which I ended up liking so much that i purchased the 'fully paid for' version.. (link below )
https://www.totalav.com/en/free-antivirus
Here's a link that's worth checking out for more info on Anti-virus programs, This isn't an exhaustive list and there are programs that haven't made it onto the list, but it gives you a bit more info..
https://www.techradar.com/uk/best/best-antivirus