Although Microsoft has ended XP support on April 8, 2014, a simple registry hack to a Windows XP system tricks Windows Update into providing updates for it. Just follow these steps…
Step 1: Create a txt file and put the following in:
Windows Registry Editor Version 5.00
Step 2: rename it to : update.reg and execute it.
Step 3: Restart your computer and make sure Windows Update service is running.
You will see there are updates for you to install! And your XP PC will continue to receive MS patches until the year 2019.
This is for 32-bit XP. There is a different method for 64-bit version of XP (by spoofing Windows 2003 server).
This trick works because it makes Windows Update think you’re running POS2009 (Point Of Service 2009) which is basically XP for cash registers and other “point-of-service” PC’s. Microsoft provides update support for POS2009 until 2019.”