Free unlimited installation and compatibility support for WinXP SP3 was
available from 14 April 2008 thru May 2009. Such support will cost you
US$59 or higher per incident now.
Note: Extended Support for WinXP (x86) SP2 ends on 13 July 2010. After that
date, computers running WinXP (x86) SP2 will NOT be offered any further
critical security updates, Automatic Updates will not work, and Windows
Update website will not be accessible until SP3 is installed.