Deathdude is correct.
Taken from Wikipedia ...
Support for Windows XP without a service pack (
RTM) ended on
September 30, 2004 and support for Windows XP Service Pack 1 and 1a ended on
October 10, 2006.
Mainstream support for Windows XP Service Pack 2 will end on April 14, 2009, four years after its general availability. As per Microsoft's posted timetable, the company will stop licensing Windows XP to OEMs and terminate retail sales of the operating system June 30, 2008, 17 months after the release of Windows Vista.
On April 14, 2009, Windows XP will begin its "Extended Support" period that will last for 5 years until April 8, 2014.