If you just want to remove photo meta data I recommend you download JPEG & PNG Stripper which operates on JPG/JPEG/JFIF & PNG photos. The executable named stripper.exe works on Windows operating systems without installation, and you can remove your images’ meta information by dragging the photo in the applications GUI. If you want to bulk-remove meta data from photos you can run JPEG & PNG Stripper in command line mode.
A note to users of Windows Vista: Vista displays a Remove Properties and Personal Information feature in the photo’s properties details tab. When I tested it in one of its two modes (create a copy with all possible properties removed) it failed to remove some meta information – in contrast to stripper.exe shown above.