The Worst Dialog Box in Mac OS X

I’m copying a bunch of files into a folder. I want to copy the files that are not already in the folder, but not copy (and not replace) the ones that are.

I don’t understand what I have to do to get the desired effect. I don’t understand what the buttons do — does «Stop» stop the whole copy operation, or does it just not copy the specific file it is talking about? In fact, I’m not sure what the dialog box is telling me, and I don’t even understand how to cancel the whole operation so that I can copy the files individually and avoid that dialog box.

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