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Description:  

Prevents the Screen Saver dialog from opening in the Personalization or Display Control Panel.
     
This setting prevents users from using Control Panel to add, configure, or change the screen saver on the
computer. It does not prevent a screen saver from running.

Supported on: At least Windows 2000.
Prevent changing screen saver
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 screen saver.
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
\System
and locate NoDispScrSavPage 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 NoDispScrSavPage and edit the value:

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

To Disable:
Change the data value with:
NoDispScrSavPage = 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\System" /v NoDispScrSavPage /t REG_DWORD /d 1 /f

Disabled:
REG add "HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System" /v NoDispScrSavPage /t REG_DWORD /d 0 /f
Not Configured:
REG DELETE "HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System" /v NoDispScrSavPage /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\System"
oReg.CreateKey HKEY_CURRENT_USER,strKeyPath
strValueName = "NoDispScrSavPage"
'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 + "\System"))
{
 $RegKey = "HKCU:\Software\Microsoft\Windows\CurrentVersion\Policies\System"
  ##Enabled
  New-ItemProperty -path $RegKey -name NoDispScrSavPage -value 1 -PropertyType DWord -Force
  ##Disabled
  ##New-ItemProperty -path $RegKey -name NoDispScrSavPage -value 0 -PropertyType DWord -Force
}
else
{
 New-Item -path $RegKey -name System
 $RegKey = "HKCU:\Software\Microsoft\Windows\CurrentVersion\Policies\System"
  ##Enabled
  New-ItemProperty -path $RegKey -name NoDispScrSavPage -value 1 -PropertyType DWord
  ##Disabled
  ##New-ItemProperty -path $RegKey -name NoDispScrSavPage -value 0 -PropertyType DWord
}

Not Configured

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

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