How are you running Windows? I'm assuming it's through Parallels, since Windows can't natively even see an HFS+ partition. In this case, sorry, but I think you'll have to live with the visibility of those hidden files and folders. I can't think of a way to configure Windows to NOT show files that lack Windows attributes (like "system" and "hidden"). Of course if there's a way to do it, someone will post soon with instructions. That's the beauty of these forums; I get to learn stuff too.