I recently spent 3 days trying to fix the problems with my pc-email and IE9. I am a loyal user of avast but it failed to(as did most of my efforts) identify a problem that turned out to be from Yontoo?? and Funmoods toolbar??..where I got these is unknown to me as I did not seek either-I believe they may be one in the same or each a part of the other. So I suspect it was malware somehow sneeking on to my system from a program or email etc. Longer story longer…I believe these should be identified as virus or malware at the very least and looked into by Avast. I used Hijackthis to remove by the way. What was happening was I could not delete, or send any email…would get "unable to…without a valid crumb’ message in red along the top of my email page…
no security program have 100% detection…
…It is possible that this is detected as PUP = possible unwanted program
did you try a quick scan with malwarebytes?
Toolbars are usually bundled with other software downloads, etc. and that is the most common way they are installed as the user is effectively giving permission.
The toolbar is more adware than malware. MBAM (specialist anti-malware) as suggested by Pondus is likely to detect adware/toolbars, etc.