question on desktop display

I currently have a United States slideshow theme for my desktop background, but would really like to have pictures of family members in a slide show. I was able to do this on my old Win XP pc but have had no success in doing it on the new Win 7 pro.
When I do succeed in displaying a single photo it is much too large for the screen and is not only distorted but displays on a portion of the photo. I have tried reducing the size of the photo with a photo editor but to no avail - the size is not reduced on the monitor?

What am I doing wrong - can someone suggest a remedy?

Frank

FDM, what photo editing program are you using? I have been using IRFANVIEW for quite a few years and it does everything perfectly, and is free.

FDM said:

What am I doing wrong - can someone suggest a remedy?

I can only tell you what I do.

My monitor is set to 1600 x 900 resolution. I have my taskbar at the bottom of the screen.

Allowing for the taskbar height, I resize each picture manually to 1600 x 837 in Photoshop and save them as Tiffs. With those dimensions, the picture is full screen wide and sits right on top of the taskbar.

I then put them all in a folder called wallpaper on my D drive. I set the desktop background to shuffle them every 3 hours using the "tile" picture position in the dropdown list.

Thanks to ignatz, jvsimo1 and Shawn for the responses and suggestions - all helped resolve my problem.

Frank