I'm running WIndows XP SP3. I've been getting some weird behaviour that started yesterday and is continuing today. Windows is ignoring some of my mouse clicks, particularly on frame controls. For instance, when I click on minimize or maximize, those clicks are just ignored. Sometimes, but not always, clicks on the program icons on the blue bar at the bottom are ignored; that includes the Start button. When that happens, I can get them to start working again by doing a CTRL-ALT-DEL and then clicking in the Task Manager interface. Yesterday, when this first happened, I tried a reboot but when then when I got to the Windows logon screen and tried to click on the appropriate login ID, that click was ignored too. Additional reboots had the same problem until I discovered that doing a CTRL-ALT-DEL on that screen would get me to a Windows Login screen that DID work. I can't imagine why this is happening. Can anyone suggest a cause and a resolution for this problem? I have two GB of memory. I have 82 processes running. CPU usage rarely goes over 5%. Available physical memory is around 230,000. The computer has been running fine aside from this issue.