As far as whether it's related to the viruses all I can say is that the old IM worked before I installed avast.
When we installed avast and the new IM with voice, the im did not work. We looked at the configurations of both. Made changes, etc... What changes we made I'm not sure of any more. Can you tell me what the configurations should be?
The firewall in use is the one that came with windows xp pro.