Prevent changing desktop background using group policy

Prohibit users from  changing the background

1.Under User Configuation -> Policies -> Administative Templates -> Control Panel -> Personalization -> Prevent changing desktop background  Enable - enable this radio button

( To prohibit users from  changing the background )

2. Close Group Policy Management Editor Window

3. Run " gpupdate /force " in DC.

4. In clients i also run the command " gpupdate /force ". Then restart or Log off.