Thanks Dave, but it's not an internet issue. I want to permit users to access an MS Access database (2002 version) from which a it'might' be blocked. If Office 2010 is installed, the Trusted Locations can be added. If not, then I hoped there might be an option under Windows 7 security model.
But perhaps the concept of Trusted Locations only applies to Office 2010 files, and I'm barking up a wrong tree (again).