Hmm, well I assume you don't want it to display the popup for Automatic Updates but actually DO want the updates from time to time?
If that's the case go back into Security Center and at the bottom of the menu, click on "Automatic Updates" which is under the "Manage security settings for:" menu. Once you're in there, you'll want to click on the second to last choice titled "Notify me but don't automatically download or install them." option.
This is what I have mine on since I don't like to automatically download anything unless I know exactly what it is. The next time Automatic Updates pops up it will give you the option to hide the updates (which essentially will just make never pop-up again unless you unhide them through the Windows Updates website.)
I hope that helps, SP2 can be annoying but once you get around it I think it works out for the better. Good luck!