This may seem naïve, but I ask it anyway. If you download a program which, unknown to you, has a trojan bundled up with it, when you install the program PG will ask you if you want to permit that installer to run. You will unwittingly answer in the affirmative – so how can PG protect you in these circumstances? You are installing what you believe to be a legitimate program and when the cuckoo in the nest (i.e. the trojan) tries to run it will have a plausible name related to the genuine program and you will be none the wiser and will give it permission. In that way PG will be circumvented – or so it seems to me. How can PG protect you in these situations? It always seems to me that the big Achilles (was he Greek or Trojan!!!) heel of PG is human error – how do we minimize this?