I have a dell inspiron laptop. At first I had a windows vista operating system in my laptop. Later I upgraded my operating system with the windows 7 64 bit operating system. Well the problem is that whenever I leave my laptop idle for sometime the screen saver comes in and when I resume with my work, I notice that my system has got totally hanged. I am not able to move my mouse or do anything. End task, ctrl +alt+del buttons do not give any result. The last option left before me is to restart the system. However one point to note here is that it does not freezes while doing anything else. It just interferes while a screensaver is switched on. I know the problem is little strange then also if you have any other solutions for me then do let me know as early as possible.