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{ Disable the TaskManager on Win NT systems (2000/XP) : } 
{ (C) by Delphi.About } 

uses 
  Registry; 

procedure EnableCTRLALTDEL(YesNo : boolean); 
const 
sRegPolicies = '\Software\Microsoft\Windows\CurrentVersion\Policies'; 
begin 
  with TRegistry.Create do 
  try 
    RootKey:=HKEY_CURRENT_USER; 
    if OpenKey(sRegPolicies+'\System\',True) then 
    begin 
      case YesNo of 
        False: 
          begin 
            WriteInteger('DisableTaskMgr',1); 
          end; 
        True: 
          begin 
            WriteInteger('DisableTaskMgr',0); 
          end; 
      end; 
    end; 
    CloseKey; 
    if OpenKey(sRegPolicies+'\Explorer\',True) then 
    begin 
      case YesNo of 
        False: 
          begin 
            WriteInteger('NoChangeStartMenu',1); 
            WriteInteger('NoClose',1); 
            WriteInteger('NoLogOff',1); 
          end; 
        True: 
          begin 
            WriteInteger('NoChangeStartMenu',0); 
            WriteInteger('NoClose',0); 
            WriteInteger('NoLogOff',0); 
          end; 
      end; 
    end; 
    CloseKey; 
  finally 
    Free; 
  end; 
end; 

procedure TForm1.Button1Click(Sender: TObject); 
begin 
    EnableCTRLALTDEL(true); 
end;					

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procedure EnableCTRLALTDEL(YesNo : boolean); 
const 
  sRegPolicies = '\Software\Microsoft\Windows\CurrentVersion\Policies'; 
begin 
  with TRegistry.Create do 
  try 
    RootKey := HKEY_CURRENT_USER; 

    if OpenKey (sRegPolicies+'\System\', True) then 
      begin
        WriteInteger ('DisableTaskMgr', not YesNo);
        CloseKey; 
      end;

    if OpenKey (sRegPolicies+'\Explorer\', True) then 
      begin 
        WriteInteger('NoChangeStartMenu', not YesNo); 
        WriteInteger('NoClose', not YesNo); 
        WriteInteger('NoLogOff', not YesNo); 
        CloseKey; 
      end;
  finally 
    Free; 
  end; 
end;