"Use notepad to copy the following and save as .reg file - and then run
it (double-click the file).
Windows Registry Editor Version 5.00
Restart your computer, and make sure WindozeUpdate 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 for the purposes of WindowsUpdate, it makes WU
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."