Today, by mistake, I selected the menu item "XBOX LIVE" again, and I was surprised to see a screen that said "Xbox Live is updating your system. Please don't turn off your Xbox console." - I never asked Microsoft do do any update, as I was very content with my Xbox as it was, and there was no warning screen of any kind, it just started updating the second I selected "XBOX LIVE". Fearing that turning off my Xbox could harm my data stored on the hard drive, I followed the onscreen orders, waiting for the update to be finished.