How to stop my Windows background from changing?

Windows 7 allows admin to activate a feature that prevents users from changing the wallpaper of the computer.

How to prevent users from changing wallpaper?

• To restrict users from changing the wallpaper (under your Administrator account), click on Start > Run > type gpedit.msc and press enter.
• Next, go to Local Computer Policy > User Configuration > Administrative Templates > Desktop.
• In the right pane, select Desktop wallpaper and enable it.
• Indicate the full path for your custom/default wallpaper.
• Center and stretch the image as required and press the OK button to validate.
• Now, restart your PC to check the results.