When I boot, after screen and all icons appear, the mouse remains frozen until I hit a key on the keyboard (I usually use the shift key as it seems least likely to do damage, but any key seems to work). The keyboard is always fully functional. I have had this problem before, and then, inexplicably, the problem disappears. Usually this problem appears after a system change (an install of software) and disappears after the same thing. But the intervals between changes last months. And not every install, or system change creates this change. I do not any special software or hardware configurations, just an A8N-E Asus motherboard with an AMD processor. The keyboard and mouse are connected via PS/2 connectors. This freeze also occurs after a mode change from Standby or Hibernation. The mouse is a Logitech light driver device; the keyboard a standard 101 generic variety. Driver re-installs of both mouse of keyboard have no effect.
I suspect some key in the registry is responsible for this, but I would not know where to start looking or for what. If you have an idea, I am willing to give it a try. Thank you for reading.