Other than, at any given time, any one of the AV/FW apps can be by-passed by malicious coding.
Classic indicator of the following five items:
1. Anti-Virus and Firewall paid version not up to date
2. Not having a secondary pop-up blocker such as 12Ghosts
3. Not using a paid version of Malwarebytes
4. Opening up junk which may be infected, without thinking about it first
5. Going to sites which have questionable programming attached to it
Here is a general rule, all security apps at some point have problems; Mcafee is more of a corporate app, Norton is infamous for stuff getting by…personally I use ZoneAlarm, and recommend to the novice or home user AVG…
If you do switch, make sure you get your current versions removal tool prior to installing a new version or another app; I hope this helps.
uhg...IMHO, AVG is a resource hog and will slow down many home systems, especially older computers that don't have a lot of RAM. I like Avast! better.
I use Zone Alarm - never seem to have a problem...