You can block EXE with Avast IS?

Avast Free Antivirus / Premium Security
1

Hello
Sorry for my English. Everything is translated through translator
I wanted to know if there is way to block using Avast IS the EXE. Block in sense not to install if you know protecion key Avast settings that can be put
I ask this because my brother installed without knowing much crap
I can I leave the license number only by private
thanks

2

You may be better to ask this in the Spanish forum http://forum.avast.com/index.php?board=25.0 where the comprehension of your question will be better understood.