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As yet, there is no "SP3" for Windows XP, although there is a third-party download purporting to be SP3. It did not originate from Microsoft and should not be installed.
I would be concerned by the lack of the padlock symbol as this can be double clicked to view the Security Certificate of the website concerned.
In Internet Explorer's menus, "Help > About Internet Explorer", check that the Cypher Strength is "128-bit".