As of april 8, 2014 Support for Windows XP and Office 2003 ends
Windows Update notification to all Windows XP users
In the interest of educating all our customers about Windows XP end-of-support, Windows Update will send a pop-up dialog box to reachable Windows XP machines with an end of support notification. The notification will state, “Learn about the end of support for Windows XP (April 8, 2014).” The notification will first be sent on March 8, 2014 at 3pm local time, and is scheduled to be sent monthly thereafter.
We want you to know that the notification is genuine. If you don’t want to see the notification again, please click “Do not show this message again” to stop the notification from recurring.
Please contact Microsoft or our valued partners for assistance.