Please, can anyone help me to allow my browsers to access internet again?

My pc has just been reformatted because of this problem and the guys I asked for help don’t know how to fix it. After formatting and installation of OS, I installed Avast Internet Security which I paid for 2 years subscription. After a day, my browsers are havin the same problem. I am alarmed that even after installing Avast Internet Security and doing all the security scans and protection available I still get this problem.

Try turn off AOS

avast! 2014: Managing avast! CommunityIQ participation http://www.avast.com/en-eu/faq.php?article=AVKB137#artTitle

Also, let’s check does your computer has access to internet.

Start the command prompt (cmd) by pressing the windows button + R button on keybord or using windows search form by typing cmd.

A black screen shall open. In that black screen type the following:

ping www.google.com

notice the space between! !

Do you get the responce from google? It should look like this: