Thanks Hornus, but few days ago I reinstall avast! with ZoneAlarm installed and running and everything works fine. Few days ago, I have to do the opposite: I installed ZoneAlarm with avast! running. Ok, again.

Of course, NAV is out of my considerations right now. It usually does the worst job of every antivirus applications (conflicts, poor Windows Registry handling, trash, and so on).

I have no trouble installing Windows Updates with avast! running either :wink:

Anyway, the user always can disable the antivirus before installing software for sure :wink: