End of Support: Microsoft's Service Pack 1

On July 11, 2006 and October 10, 2006, Microsoft will end all public assisted support for Service Pack1 (SP1) (see affected products). 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 the products, it is recommend you upgrade your computer, for free, to newer Service Pack.

See the details HERE.