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Description:  

Prevents users from adding or changing the background design of the desktop.

By default, users can use the Desktop Background page in the Personalization or Display Control Panel to
add a background design (wallpaper) to their desktop.

If you enable this setting, none of the Desktop Background settings can be changed by the user.

To specify wallpaper for a group, use the "Desktop Wallpaper" setting.

Note: You must also enable the "Desktop Wallpaper" setting to prevent users from changing the desktop
wallpaper. Refer to KB article: Q327998 for more information.

Also, see the "Allow only bitmapped wallpaper" setting.

Supported on: At least Windows 2000.
Prevent changing desktop background
Description Gpedit Regedit CMD Back VBScript PowerShell Script
Gpedit:   

Please perform the following steps:

Please go to Pearl button (Start) and click on the Search programs and files
For more information about the change from Start to Pearl button click here
Type gpedit.msc and press Enter
In the Group Policy window please navigate to User Configuration -> Administrative Templates ->
Control Panel -> Personalization and open Prevent changing desktop background.
Not Configured -> is the Default state
Enabled -> apply this GPO
Disabled -> this GPO will not be applied

To finish press ok button and close Group Policy window.
Type regedit and press ok
Please confirm User Account Control pop-up
Microsoft official disclaimer

Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by
using another method. These problems might require that you reinstall the operating system. Microsoft
cannot guarantee that these problems can be solved. Modify the registry at your own risk.

Note: This registry key is created by Group Policy when this GPO is Enable or Disable. The GPO Default state
is Not Configured -> this registry entry is not present.

Please navigate to HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies
\ActiveDesktop
and locate NoChangingWallPaper registry key
Regedit:          

Please perform the following steps:

Please go to Pearl button (Start) and click on the Search programs and files
For more information about the change from Start to Pearl button click here
   
   
Double click on NoChangingWallPaper and edit the value:

To Enable:
Change the data value with:
NoChangingWallPaper = 1

To Disable:
Change the data value with:
NoChangingWallPaper = 0

To finish press ok button and close Registry Editor window

Note: Manual editing of this registry key will not be reflected in Group Policy. If you modify this GPO from
Group Policy this registry key will be rewritten.
Type cmd, right click on cmd icon under the Programs and click on Run as administrator
Please confirm User Account Control pop-up
Please select, right and copy a registry key from below, then right click on command prompt window
, select Paste and press Enter

Enabled:
REG add "HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\ActiveDesktop" /v NoChangingWallPaper /t REG_DWORD /d 1 /f

Disabled:
REG add "HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\ActiveDesktop" /v NoChangingWallPaper /t REG_DWORD /d 0 /f
Not Configured:
REG DELETE "HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\ActiveDesktop" /v NoChangingWallPaper /f

Note: Manual editing of this registry key will not be reflected in Group Policy. If you modify this GPO from
Group Policy this registry key will be rewritten.
CMD:          

Please perform the following steps:

Please go to Pearl button (Start) and click on the Search programs and files
For more information about the change from Start to Pearl button click here
   
VBScript:          

Const HKEY_CURRENT_USER = &H80000001
strComputer = "."
Set oReg=GetObject("winmgmts:{impersonationLevel=impersonate}!\\" & _
strComputer & "\root\default:StdRegProv")

strKeyPath = "Software\Microsoft\Windows\CurrentVersion\Policies\ActiveDesktop"
oReg.CreateKey HKEY_CURRENT_USER,strKeyPath
strValueName = "NoChangingWallPaper"
'Enabled
dwValue = 1
'Disabled
'dwValue = 0
oReg.SetDWORDValue HKEY_CURRENT_USER,strKeyPath,strValueName,dwValue
'Not Configured
'oReg.DeleteValue HKEY_CURRENT_USER,strKeyPath,strValueName
PowerShell Script :          

Enabled\Disabled

$RegKey = "HKCU:\Software\Microsoft\Windows\CurrentVersion\Policies"
If(Test-Path ($RegKey + "\ActiveDesktop"))
{
 $RegKey = "HKCU:\Software\Microsoft\Windows\CurrentVersion\Policies\ActiveDesktop"
  ##Enabled
  New-ItemProperty -path $RegKey -name NoChangingWallPaper -value 1 -PropertyType DWord -Force
  ##Disabled
  ##New-ItemProperty -path $RegKey -name NoChangingWallPaper -value 0 -PropertyType DWord -Force
}
else
{
 New-Item -path $RegKey -name ActiveDesktop
 $RegKey = "HKCU:\Software\Microsoft\Windows\CurrentVersion\Policies\ActiveDesktop"
  ##Enabled
  New-ItemProperty -path $RegKey -name NoChangingWallPaper -value 1 -PropertyType DWord
  ##Disabled
  ##New-ItemProperty -path $RegKey -name NoChangingWallPaper -value 0 -PropertyType DWord
}

Not Configured

$RegKey = "HKCU:\Software\Microsoft\Windows\CurrentVersion\Policies"
Remove-ItemProperty -Path($RegKey + "\ActiveDesktop") -name NoChangingWallPaper
If( (Get-Item -Path($RegKey + "\ActiveDesktop")).ValueCount -eq 0 -and (Get-Item -Path($RegKey + "\ActiveDesktop")).SubKeyCount -eq 0)
{
 Remove-Item -Path($RegKey + "\ActiveDesktop")   
}
Up Back
   
   
   
Result
By Default you have access to "Desktop Background" under Start -> Control Panel -> Personalization.
You can prevent users from using "Desktop Background" using Group Policy or modify the specific
registry key.  

Note: If you want to prevent a specific user from using "Desktop Background" you need to modify or add
the
registry key under his SID.