The xp-AntiSpy is a little utility that lets you disable some built-in update and authentication 'features' in WindowsXP. ssFor example, there's a service running in the background which is called 'Automatic Updates'. I don't know what this service transfers from my machine to other machines on the internet, especially the MS ones. So I play it safe and disable such functions. If you like, you can even disable these functions manually, by going through the System and checking or unchecking some checkboxes.