XP-AntiSpy is a small utility designed to quickly disable some built-in update and authentication features within WindowsXP that may raise security or privacy concerns in some people.
For example, there is a service running in the background which is called Automatic Updates... that may sound useful to most people, but suspicious to others. You can disable all these features manually by going through your configuration, find the settings for each etc. However with XP-AntiSpy there is no need to do this, since it will show you all of them at once and let you choose which ones to disable.
Not only will it save you a lot of time disabling them - it will also allow you to quickly re-enable them if you change your mind.