Set Default Print Setup

Okay, you see how Paper Size says Legal?

I want to find out how to make it default to Letter because sometimes something will print, say from e-mail, as a PDF & I don't get the option to change it. And, frankly, sometimes I just wanna click Print & OK & be done with it.

And, yes, I've gone into Printer Properties a zillion times to make sure it's set to Letter there:

Thanks a million!