You realllly are over reacting. The third stage was "planned" not guaranteed. The servers were shutdown and the infection was in a specific ccleaner version. All this announcement/press means is Avast is being transparent about what they're finding through autopsy.
If you feel you might be infected, instead of reformatting the pc, blindly and rashly, seek aid at a trusted malware fighter site, such as those described in rule 10 of our forum rules (found at bottom of the forum index page).