A few words of thanks would be greatly appreciated.

Avast: Enable detection of potentially unwanted software

Latest update on July 28, 2011 at 10:23 AM by jak58.

The Avast antivirus detects viruses and malwares, but it is also able to protect you against adware and unwanted (search bars, intrusive adware, etc.) programs.

This option is not enabled by default. Here's how to activate it.
Open Avast, go to "Resident protection", "File Agent" and click on "Expert Settings
In the "sensitivity" section, select "Find potentially unwanted software (LPI)"
Repeat the operation for the other agents.