Best answer as chosen by user UGADOG1: Did you check the registry entries for this?

by R. Proffitt Moderator - 1/31/13 7:32 AM

In Reply to: XP Pro "Automatic Update" Service mystery by UGADOG1

http://support.microsoft.com/kb/328010#method3

Because Microsoft is changing the OS to cater to consumers, everything must be as automatic as possible. We've taken MSFT to task over security and in response the updates push all the settings to be such that the updates and more are to get the updates and close up the security holes.

Along the way, folk that want control over the PC are going to feel trampled.
Bob