Ads by Browse to Save - Problem

About a week I have this problem with this adware “Ads by Browse to Save” in my computer and after call the Avast support here in Brazil, where I live, they told me that I should to buy the Avast! Internet Security and certainly the problem would be fixed. I did it and according the support I should make a complete scanning in my computer, with hight level of sensibility.
Well, it didn´t work. Avast! didn´t see anything wrong and according to it my computer is ok and fully protected.
Now, I just have contacted the support again and a guy told me that I should buy a different Avast! version.
Seriously?
Til now I always recomended Avast! as the best antivirus to everyone but at this point I can´t say this again.

Someone could help me to take out this adware from my machine, please?

Thanks in advance!

Mauro

Run the first two programs in this guide and post the logs here…

http://forum.avast.com/index.php?topic=53253.0

AdwCleaner
Malwarebytes