Dear Friends, I use Windows XP Pro SP1. When I connect to the Internet, a Notification box comes with countdown of 60 Seconds saying that "This System is shutting down. Please save the work and log off. Any unsaved changes will be lost. This shutdown is initiated by NT/Authority System (Remote procedure call has shutdown unexpectedly)". And after the countdown, the system Restarts. This occurs very often. First of all what is NT/Authority system?. Is this is a hacking or a virus or OS Problem?. I have norton antivirus 2004 and it is up to date. Is there any solution to get rid from this Problem???