windows autoupdate will not die

i have autoupdate turned off and i am still seeing the users computer constantly communicating with microsoft.. on my intrusion logs i see this below over and over again,, does anyone have any idea how to put the kebosh on it at the users machine?? ,, xpp sp2;
wwwbaytest2.microsoft.com
wwwbaytest3.microsoft.com
wwwbaytest4.microsoft.com
wwwbaytest5.microsoft.com
wwwkttest4.microsoft.com