Hello Dave

Here is how to fix your problem...
1: RIGHT-click on am empty spot on the desktop
2: Select “Personalize”
3: Select the link below that says, “Desktop Background”
4: Under the drop down menu select, “Pictures Library”
5: (optional) If the desktop background you have is not listed under there hit the “Browse” button
6: Select the image you want to set at the desktop background
7: Near the bottom-left of the screen under the “Picture Position” header, select any One of the following options…
“Cener”
“Fit”
“Fill”
8: Last, hit the “Save changes” button