Using WXP SP3, IE8, have started getting message "Current webpage is trying to open a site in your Trusted Sites list. Do you allow it?" ...and then cites the Trusted Site as res://ieframe.dll

This only happens with certain web sites, although I sense it's getting worse. One such site is the Wall Street Journal Europe

How can I stop this, plse? I note one or two 'solutions' in terms of independent software available on the net, but how can I trust them not to compound the problem?