Well, the light sensitive element in most digital cameras is about the
size of your driver's license photo (if it's that big). Is that the
"original size" you want? I didn't think so. There's a wide variety of
Dots (pixels) Per Inch (DPI) and there's not really any "100%" size
unless the DPI factor is taken into account. Many late model "point and
shoot" digital cameras produce images that would be two or three times
the size of your computer display if every pixel of the image was
displayed as a full pixel on the display.

There are alternative photo editing applications which may have a wider
set of options than the applications that come with Windows. Some of
those applications are included with scanners and digital cameras. A few
of the applications like ifranview ( http://www.irfanview.com/ )can be
downloaded for free or a modest charge.

The options offered in the Picture and Fax viewer "print" function are
based on the default paper size in your printer options. Open the
options window for your printer and change the paper size (and other
options, such as borderless printing, if available).