I have a serious problem. 3 of the 10 Windows 7 workstations in our office have had the screen saver stop working. They are set to 20 minutes, blank, ask for password. They are ignoring these settings. Two of the workstations are currently logged of, but the login screen stays up -- all night, over the weekend, etc. The 3 is logged in and the user's desktop stays up and visible. This is especially bad as anyone could get onto this user's computer and do whatever they want.
Why is this happening and how can I fix it?