When you 'turned off the updates' and went to Start>Control Panel>Security Center, did you also go to the left-hand side of the window under Resources (on the very bottom) where it says, "Change the way Security Center alerts me"? And uncheck "Automatic Updates" and press OK?
Another way of getting rid of the notifications is to install the updates. With those that fail, there's generally a reason why. But..I presume you know that already.
If you've tried the above and it doesn't help, please post back and you'll get the help you need.
I don't like getting interrupted when I am off the internet using a program with some MS update prompt trying to break through to tell me that I have an update to install or that an update failed.
Is there a way to stop getting the notification, MS prompts, trying to break through and distracting me in the middle of something? (in other words a "Do not disturb" sign on the door when I am using a program)
I already tried turning off updates and the "prompts" keep coming to tell me I can't get an update because I have updates turned off.