I get a similar thing teaching a coding club.<p>I'm not sure how the machines are set up, as I have an aversion to Windows from my time as an NT 'certified professional', but at least one machine will spend 10 minutes 'updating' during any class.<p>No doubt you can turn this off or set update time windows or whatever, but I'm not the admin for these machines. At least the updates generally work. For my kids' machines at home, almost anytime they boot windows, it will do an update, and a good percentage of the time, the update will fail, and brick the machine, requiring a complete re-install.