closed as not a real question by Xavierjazz, Canadian Luke, Renan, Simon Sheehan, HackToHell Jan 6 '13 at 5:37
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AFAIK the non-installer versions are not truly portable, so I recommend you use the one packaged by the PortableApps guys that uses their own wrapper to prevent system access (in terms of writing files/settings to AppData, the registry and other locations). (Of course, Windows will always record traces of program usage in the registry.)