How do I prevent wall paper from being cahnged. I run a computer department at a local school and my older students are saving images from the Internet as wallpaper. Some of these images are not appropriate for younger students.
I have a program that is supposed to lock changes to the desktop but apparently the Internet Wallpaper saves are not included.
Also, how do I delete the images already saved. I can restore the desktop to the appropriate settings, but when the log in screen comes up, some of these images are briefly shown before the standard desktop loads.

------------------
when at the bottom, you can always look up!