This just started about two months ago - Users throughout our network willhit Ctrl-Alt-Del and ... nothing happens. No Task Manager, no screen change, nothing.These are all XP SP3 desktops spread across different hardware, different builds, etc.. The software suite installed is fairly consistent. Users have all sorts of rights (Admin, Restricted User, etc..). The only consistency is that if it's happening for a user, it seems to happen to that user again... every couple of days, once a week, etc.. I've done SFC, malware, antivirus - no luck.We've used some online java-based keyboard applets to monitor for keyboard activity, and the system sees the keys being pressed; they just doesn't create the desired, normal effect.Windows-L works fine, and once Win-L is pressed, Ctrl-Alt-Del starts working again.Any ideas? Even some troubleshooting resources would be great.1 person needs an answerI do too