after April 8, 2014, technical assistance for Windows XP will no longer be available, including automatic updates

If you continue to use Windows XP after support ends, your computer will still work but it might become more vulnerable to security risks and viruses.

http://windows.microsoft.com/en-GB/windows/end-support-help

Win-XP-Support-End

After support for XP expires. any computers running XP will not be covered under current support terms.

If you still require support for any computers running XP after this date please send an request to see how support will be handled

Current recommendation is to remove these computers from your network until you have a plan in place!!!