I hate to be the sore loser, but check two posts above Pazuzu.
The info was on DSLreports.com in the forums. It's all over the place though. Fromo the MS newsgroups:
http://www.microsoft.com/communities/newsgroups/en-us/default.aspx?dg=microsoft.public.windowsupdate&tid=f169d36e-4623-47c3-b248-24be1ef0d9e5&cat=en_US_56d1dd45-de9e-4fc5-9bc1-2d1d0de6daee&lang=en&cr=US&sloc=&p=1
Windows did an automatic update last night on my laptop, but I was using it and after a few interruptions asking if I wanted to restart, I turned WU off.
BTW, it's a good idea to have a broadband router in between your cable modem and computer. I'm going to guess that the I.P. number on your computer does not start with 192.168.x.x. There is a good chance that your computer can be "seen" on the Internet.
P.S. I already slipstreamed SP3 into XP Home, XP Pro (retail and OEM), Dell XP Home. Makes it so much easier to reinstall on machines.