I completely uninstalled ZA, removed anything I could find in regedit, ran CCleaner and RegSeeker, and then reinstalled. Every single file that refers to Klif is back, including the one that caused all the trouble. And yet Avast is still scanning fine. Is it me........?
The thing I like about ZoneAlarm is that at the start, when it's asking permission for programs to connect to the internet, it makes it obvious what's trying, by giving you the name of the program rather than a set of numbers, which means you are always pretty confident as to whether you should allow something access. You can also tick a box so that you aren't constantly told of when it's blocked something from the internet ('informational alerts'). Is Comodo similar?