The reason I have been using MSPaint is because when I paste image #1 on top of image #2 in Paint.Net, Image #1 maintains the checkerboard background around it. So I had to open up the combined image in another program to "confirm" that the checkerboard was in fact transparent, but unfortunately it's not. When I combine the images in Paint.Net, and then open the file using Windows Photo Viewer, the region that appears as checkerboard in Paint.net shows up as white. Basically, it's checkerboard in Paint.Net, and white everywhere else. And I don't know what to do to fix it.