the best advice is to say "i know this is a scam" and hang up..
this is big business, if you make it clear to the operator you know its a scam they **may*** cross your name off the list...
if you are rude or go along with it for a bit they will mark you as a prospect so you will keep getting calls...
Erm, that's a Trojan not a virus. You actually need to authorise the installation (it masked itself as a Flash update) whereas a virus installs itself. OS X, just like Linux isn't immune from getting infected with Trojans but the risk is minuscule.
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I've never had a call from "Windows" though my friends have. Guess they actually know I live in an all Mac household (although I do run Windows sometimes though!)
Don't know whether it would help with this, but you can add yourself to the Telephone Preference Service to avoid calls.
Rgds
I would have just said "Thank you come again" and then throw the phone into the sea. Bish can't call back then.
