Welcome to the forum. :slight_smile:
As you can see, following your link doesn’t present any problem here:

http://www.screencast-o-matic.com/screenshots/u/Lh/1431687569873-10112.png

May I suggest that you try doing a repair of Avast.
[b]Control panel> Programs and Features (Ad/Remove programs)> Select Avast> Select Repair:

http://www.screencast-o-matic.com/screenshots/u/Lh/1431687860621-93133.png

[/b]

When the operation finishes, Reboot the system. See if that fixes the problem.