How to disable windows update on windows server machine.
Change Windows Update settings using SCONFIG,
As with all Windows operating systems, Windows updates are available. The default setting ("Manual") is that updates are only checked when you manually invoke "6) Download and Install Updates". If you choose to enable automatic updates these are checked and installed at 3am. Whilst automatic updates gives the advantage that the server will be kept up to date (and thus less open to any vulnerabilities or bugs) it does mean that the server may reboot automatically if it needs to in order to install updates - and this might not be desirable.