I am a geek in technology. In many cases I see loads of problems in my clients computer is virus. Mostly because of the Antivirus is not updated regularly. This is the common mistake all computer user do. They think when they have installed the anti virus then all the virus will be gone.
They are wrong, sooo wrong. You need to regularly update your antivirus.
This avast antivirus has everything you need. From realtime scan to email and messenger scan. All of them is done in real time. Not bad at all for free antivirus. I even recommend the AV for all my clients. You can set the realtime scan from normal to High in no time. Separate update functions, one will update the antivirus database and the other will update the program itself. In which they are using the first opportunity when you are online to check for new update availability.
Now, in the 4.8 version they even include the anti spyware function, eventhough the function is not as good as their antivirus, it's still a good hope that something is protecting me from spyware/adware too.