And never EVER give out your credit card or any other personal info to anyone or for anything you receive by Email or in a browser popup window, regardless of who they say they are. These parasites depend on peoples' misplaced trust for their blood.
BTW, as I mentioned in another topic on scams, I'm moving ahead with putting together a free class on Internet safety for our local Senior Centers here. And I invite our other techie Members on these Forums to spare some time in their communities and consider doing the same.
You have something truly valuable to offer to others less knowledgeable, especially elderly newcomers to the Internet who grew up in a different time when criminals couldn't pick your pockets from halfway around the world.