If it is the version that ships with Avast! then note that it simply provides you with offers for Avast!, nothing else. It doesn't offer you toolbars that "hijack" your browser or anything else - it will simply offer you, very infrequently, discounts on paid-versions of Avast!.
It also pushes out security news - i.e. when CryptoLocker was first making an appearance they had popups relating to a news article telling you how to prevent damage.
It's detection by herdprotect is a false positive - note it is only detected by 2/68, and at least one has a terrible reputation.