On October 10, 2006, Microsoft will end all public assisted support for Windows XP Service Pack1 (SP1). After this date, Microsoft will no longer provide any incident support options or security updates for this retired service pack under the policies defined by the Microsoft Support Lifecycle policy...To enhance the security of your computer and to continue to receive updates for Windows XP, we recommend you upgrade your computer, for free, to Windows XP Service Pack 2 (SP2).
* Products will expire on the second Tuesday after the end of the quarter.
* Security updates released on the same day a product expires will be supported for 30 days following the release. In the event Microsoft releases a security update on the same day that a product is scheduled to end its support lifecycle, support of the security update will continue for a minimum of 30 days.