It is very annoying when you are doing some work on your computer and the dialog pops up asking to Restart Now or Later after the Automatic Updates.
Similar happened when I was watching a presentation and the computer asked the same thing. If you are also facing this problem then here are the steps to disable the notification.
1. Type cmd in the Run box to open the command prompt and type in the following line.
sc stop wuauserv
This command will automatically disable the automatic updates and the pop up will not come again, you may need admin rights for this to work.
2. Use a free tool called Auto Reboot Remover that can enable or disable the automatic reboot feature of windows XP after an update has been installed.