In this past few weeks, my AVG anti virus can’t update automatically. I’m not sure what cause the problem, but since my PC is quite laggy that time, I though there is some virus on my PC. At that time, my internet connection is very slow, thus, I can’t download a new anti virus. But now, after a little chat with xtreme tcx (The_X, or anything….he like to change his username…lol 
) he recommends me to use Avira and Malwarebytes.
Two or three days ago, my internet connection starting to perform better, then I started to download both Avira and Malwarebytes. But again, both application can’t connected to internet. So I have no choice instead of manually updating it. But now, I know the reason why my application refused to connect.