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Description:  

Specifies how much user idle time must elapse before the screen saver is launched.

When configured, this idle time can be set from a minimum of 1 second to a maximum of 86,400 seconds, or
24 hours. If set to zero, the screen saver will not be started.

This setting has no effect under any of the following circumstances:

   - The setting is disabled or not configured.

   - The wait time is set to zero.

   - The "Enable Screen Saver" setting is disabled.

   - Neither the "Screen saver executable name" setting nor the Screen Saver dialog of the client computer's
Personalization or Display Control Panel specifies a valid existing screen saver program on the client.

When not configured, whatever wait time is set on the client through the Screen Saver dialog in the
Personalization or Display Control Panel is used. The default is 15 minutes.

Supported on: At least Windows 2000 Service Pack 1.
Screen saver timeout
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 Screen saver timeout.
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\Policies\Microsoft\Windows\Control Panel
\Desktop
and locate ScreenSaveTimeOut 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 ScreenSaveTimeOut and edit the value:

To Enable:
Change the data value with:
ScreenSaveTimeOut = 900

To Disable:
Change the data value with:
ScreenSaveTimeOut = 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\Policies\Microsoft\Windows\Control Panel\Desktop" /v ScreenSaveTimeOut /t REG_SZ /d 900 /f

Disabled:
REG add "HKCU\Software\Policies\Microsoft\Windows\Control Panel\Desktop" /v ScreenSaveTimeOut /t REG_SZ /d 0 /f
Not Configured:
REG DELETE "HKCU\Software\Policies\Microsoft\Windows\Control Panel\Desktop" /v ScreenSaveTimeOut /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\Policies\Microsoft\Windows\Control Panel\Desktop"
oReg.CreateKey HKEY_CURRENT_USER,strKeyPath
strValueName = "ScreenSaveTimeOut"
'Enabled
strValue = cstr("900")
'Disabled
'strValue = cstr("0")
oReg.SetDWORDValue HKEY_CURRENT_USER,strKeyPath,strValueName,strValue
'Not Configured
'oReg.DeleteValue HKEY_CURRENT_USER,strKeyPath,strValueName
PowerShell Script :          

Enabled\Disabled

$RegKey = "HKCU:\Software\Policies\Microsoft\Windows"
If(Test-Path ($RegKey + "\Control Panel"))
{
 $RegKey = "HKCU:\Software\Policies\Microsoft\Windows\Control Panel"
 If(Test-Path ($RegKey + "\Desktop"))
 {
   $RegKey = "HKCU:\Software\Policies\Microsoft\Windows\Control Panel\Desktop"
    ##Enabled
    New-ItemProperty -path $RegKey -name ScreenSaveTimeOut -value 900 -PropertyType String -Force
    ##Disabled
    ##New-ItemProperty -path $RegKey -name ScreenSaveTimeOut -value 0 -PropertyType String -Force
 }
 else
 {
   New-Item -path $RegKey -name Desktop
   $RegKey = "HKCU:\Software\Policies\Microsoft\Windows\Control Panel\Desktop"
    ##Enabled
    New-ItemProperty -path $RegKey -name ScreenSaveTimeOut -value 900 -PropertyType String
    ##Disabled
    ##New-ItemProperty -path $RegKey -name ScreenSaveTimeOut -value 0 -PropertyType String
 }
}
else
{
 New-Item -path $RegKey -name Control Panel
 $RegKey = "HKCU:\Software\Policies\Microsoft\Windows\Control Panel"
 New-Item -path $RegKey -name Desktop
 $RegKey = "HKCU:\Software\Policies\Microsoft\Windows\Control Panel\Desktop"
  ##Enabled
  New-ItemProperty -path $RegKey -name ScreenSaveTimeOut -value 900 -PropertyType String
  ##Disabled
  ##New-ItemProperty -path $RegKey -name ScreenSaveTimeOut -value 0 -PropertyType String
}

Not Configured

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

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