What's Up!!!!.
It depend on how much Disk space you have and what your Surfing habits
are?.
You will get lots of opinions from MVPs or Non-MVPs each will recommend a
Program, so how that will help you!!!. ONLY get you to a confusion!!!.
Best outside there to my Knowledge are:
Free
Avast
AVG
Avira
BIT Defender
Those are only AV not a complete Security suite, you will need a Firewall
with any of them to be secure from hacker and other malicious attacks,
like:
ZA
Comodo
Kerio
Commercial (in Alphabet order):
Avast
AVG
Bit Defender
CA
F-secure
Kaspersky
Mcafee
Norton
Panda
Sophos
Trend Micro
etc...
Again, all of these will not help if you don't practice safe Hex with
common
sense in dealing with security on your System.
HTH.
nass