My mate put up with this for months and I turned them off for her in seconds. If you right click on the icon that appears by the date on the tasbar (it's like a blue star I think) you can chage your notification settings. The new explorer window that opens will probably tell you to buy the new one right now, but if you read on there is a link to click, which opens a new section for you to turn off notifications, after agreeing that this means you're no longer eligible for updates. Turn them off. You should still recieve updates. Sorry if instructions aren't clear enough but I can't remember the scren layouts exactly.