reply to BF69
Re: Free vs pay I've used pay and free ones. To be honest, there's so little between them apart from promotion.
The two big guys advertise and promote their products big time. It's costly. They also distribute through stores .. costly, and they maintain a well published web library of threats. These are things you don't get from freebies.
I use one of the lesser "big guys" ... CA and am now on their 3rd incarnation. Originally free, it started charging, then changed to eTrust EZ Antivirus. I liked it because it had a small footprint, but with eTrust, it grew to be significant... not as polluting to my system as Norton or McAfee, but not what it was. Then they added it to a suite and it started on the trip to just being bloatware. Then they changed to CA Security Suite when it headed to real annoying bloatware with imposing overlay windows. The AV itself has a small footprint, but started interfering with email programs. I'll dump it as soon as my current subscription dies.
I don't see a lot of difference between the freebies and the pay ones. Why spend $40 or $50 + annual charges for bloatware and a huge operating footprint when you can get the same kind of protection for free?