I used to have my wallpapers updated monthly by Group Policy. Several months ago I was prompted (I think just after logon) to grant GPO (I think) access to a wallpaper setting in the registry. It was the first (and last) time I had seen this prompt and it seems whatever response I selected stopped GPO from being able to update my desktop wallpaper. Unfortunately, I cannot remember what the setting was nor what the prompt was.
What I would like to do is re-allow GPO to update my wallpaper.
I have local admin. I'm running Windows 7.