Well bring up the shot you want, in you resolution or close to it.. Right click mouse, set as background, or wallpaper, or save as an make a file in your documents
maybe I should explain more. I used to be able to choose a picture, left click on it and get a popup asking what I wanted to do with it. I then reduced the pixel size and followed the prompts to put it on my desktop. Now the popups asking those questions do not come up. Maybe I have lost a program that allowed me to do that for years?? Any other ideas as your right click idea did not work. No questions came up about background or wallpaper......Help!