If you did that I can't understand why you are still getting them, but I haven't had any on this XP system since doing this.
I haven't done this on my win7 netbook to use that as a test bed to see what ads/info/tips are piggybacked to the auto update notification. For the most part they have been the normal auto update notification with the voiceover, regular update popup and correct duration that I set.
Whilst this netbook spends most of its time in standby, most update popups are correct, but it is possible that if there were two or more updates over a day then I could miss one.