All of a sudden, nothing has changed, but when I use the Ctrl+Alt+Del shortcut, my mouse cursor disappears and it after 2 or 3 seconds screen goes black and then after another 2-3 seconds the blue screen with the options like log out, task manager etc appears. If I hit Task manager, same thing happens. It takes like 5 seconds for it to pop up and there is a periodic black screen in the middle of the operation. What could be causing this? Edit: if I hit CTRL+SHIFT+ESC (Task manager shortcut), it's instant. So it's something to do with that blue screen. It never did it before.. should I be worried?