Yesterday several of my Networked Workstations started going to the welcome screen when operator was working on machine. Sometimes it show they are still logged in and other times it just shows the users in welcome screen meaning they are not logged in. This is happening on most of my networked machines. A couple of machines actually restart on their own. Some workstations have Win XP Pro and others Win 7 Pro. All settting on machines are correct ie: No password requireed etc. AV software is Microsoft security essentials. Also when you log back in any window that was open is reduced to very small size in upper left side of screen and the Gadgets are also stacked on top of each other in the top left corner. This never happened before that's why I don't thing its a settings issue Any Ideas?