Nightrider, fair enough and thanks.
I guess I'm a bit hooked on having as few processes running in the background as possible and something like Ad-aware comes into my "nice to have but not essential" category. That's what comes from being brought up on DOS and 386 architecture.
Just occasionally a pop-up is intentional and required; for instance when you are looking at a product in a Commercial Web-Site on-line catelogue and request more information about the product. Do these pop-up killers stop those as well?