Windows Operating System such as Windows 7, Windows Vista, Windows 2008 server etc. can automatically check for for important updates and provides option to install them. These settings are available as part of the Windows Update section under the Control Panel. Windows Update also provides option to prevent all users installing the updates, by this way you can check what is being installed on your system. This can be done by clicking Start –> Control Panel –> System and Maintenance –> Windows Update. Under Windows Update, click the Change settings link available on the left hand side.
This would display the following Choose how Windows can install updates settings.
Navigate to Who can install updates section and un mark the check box with label as Allow all users to install updates on this computer and click on the Ok button to save the changes.This would prevent all users from installing updates on this computer. If your system is being used by more than one user then this would be a recommended setting so that others cannot install windows update on the system.