Desktop Lock Express - Version 1.1 Desktop Lock Express is a security software that can lock your screen to prevent people from accessing your computer. It is one of the Desktop Lock family, which provides the major features of Desktop Lock but decrease its size to about 40KB. Desktop Lock Express can be used directly without the need of installing, all features have been included in the single exe file. Desktop Lock Express can safely lock the screen under WindowsXP/2000 as well as Windows98/ME.