Welcome to the forum. 
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.