Are you still using Windows XP service pack 2? Sorry but this is bad news for you. Microsoft will discontinue providing support for Windows XP SP2, as well as Windows 2000 Server and Client starting July 2010.
Of course, Microsoft will not leave you hanging in the air. They have made resources available to help you move to a new client and server operating system.
Stephen L. Rose of The Windows Blog has provided some resources to help guide you. Click here.