Hi Alecos,

I have been using Avast 2014 9.0.2018 Free with Comodo Free for a few months on both a Windows XP desktop computer and on a Windows 7 desktop computer without conflicts. Comodo free is just a firewall - I would expect you would get conflicts if you ran the Comodo free security suite with Avast though but that is not your intention. Avira, although good, lacks some of the features of Avast such as an email scanner which is useful to have.