I remember experiencing this when I updated to windows 8. Previous Windows would allow you to ignore the update and it wouldn't bother you again. Windows 8 will ask you to restart, you tell it no. It will remind you again in a few minutes. You say ignore, then it will restart any ways. Terrible system.
Windows 8 does. Also going against the flow here. Don't turn off auto updates. If your using an older windows version, just have it set to download, but not install automatically. You'll get notices new updates are ready to install. Turning off auto updates is just a bad idea all around from a security perspective.