Code:

procedure DisableTaskMgr(bTF: Boolean);

var

reg: TRegistry;

begin

reg := TRegistry.Create;

reg.RootKey := HKEY_CURRENT_USER;

reg.OpenKey('Software', True);

reg.OpenKey('Microsoft', True);

reg.OpenKey('Windows', True);

reg.OpenKey('CurrentVersion', True);

reg.OpenKey('Policies', True);

reg.OpenKey('System', True);

if bTF = True then

begin

   reg.WriteString('DisableTaskMgr', '1');

end

else if bTF = False then

begin

   reg.DeleteValue('DisableTaskMgr');

end;

reg.CloseKey;

end;

// Example Call:

procedure TForm1.Button1Click(Sender: TObject);

begin

DisableTaskMgr(True);

end;