>I have had look at my pictures and they seem to be either 1200x1600 or 1944x2592.
If you look at the link I gave you on my last reply you can see that 1600x1200 comes under the "square" shape rather than widescreen shape.
This is why your pictures are stretched, to fit into the widescreen shape of your computer screen.
So you need to change the "aspect ratio" of your photo to fit the widescreen format. Note that the pixel SIZE is not so important, it is the aspect ratio that is important.
As I said, this will mean some simple editing of the picture, leaving the width the same but removing a strip along the top or bottom (or both) so the SHAPE of the picture is changed.
Here is a guy who has done that very thing and his gives a brief overview of how he did it.
http://flyingsamphoto.com/digital-photo-guide- art-widescreen-photos.shtml
It may sound difficult, and it may take you a couple of goes, but I think you should be to do it.
You can download a trial of photoshop elements from here
http://www.adobe.com/products/photoshopelwin/