http://tech.slashdot.org/story/14/05/26/1637228/registry-hack-enables-continued-updates-for-windows-xp

"A registry workaround, which tricks Windows Update into thinking you are running Windows Embedded POSReady 2009, allows you to get free security updates until 2019. All you need is a simple 32bit or 64bit registry entry in order to make this work. POSReady 2009 is slated to receive security updates for another five years. Microsoft ended support for Windows XP on April 8th of 2014."