altero,
I do not agree with your bad comment, and I'm sure a lot of other Avast! users are not too.

Think a little bit
Why do you think Avast! take the time to have this kind of Public forum ?
This forum is a way to help Avast! user's when problem occur and to improve their product.
You wrote that you specialy registered to this forum to write your frustration in this discussion.
Have you tryied to get support from Avast ?
Did you open a Topic (in this forum) regarding your problem ? May be Avast! or another user could help you ?
Did you think that may be your problem is not generated by the use of Avast! ? If you are the only one with this problem, what do you think ?
From my experience (over 30years in computer business) and probably your's, it's very difficult to get a software without bug.
So when you find a company who's taking the time to listen and respond to their customer like Avast! do, instead of blaming them for anything happening, you should be more positive and help solving the problem you currently have.
You will be surprise how much the solidarity (Avast! + this forum + positive user) is powerfull.....So if you do not have anything positive to help us or at least a little good word for Avast!, please do not even respond to this post.
Despite your comment, I wish you will solve your problem and become a very happy Avast! user.