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(Updates for your Windows Store apps are handled in the Store.
Open Choose how updates are delivered: These options allow you to enable or disable the downloading, as well as the uploading, of Windows Update related files around your local network or even the entire internet.
Get System Time copies the time to a SYSTEMTIME structure that contains individual members for month, day, year, weekday, hour, minute, second, and milliseconds. You can also obtain the system time in file time format using the Get System Time As File Time function.
Get System Time As File Time copies the time to a FILETIME structure.
Notify to schedule restart: Choose this option to automatically download updates of all kind—security, and non-security.
Updates that don't require a restart will install right away but ones that do won't restart your computer without your permission.
When the system first starts, it sets the system time to a value based on the real-time clock of the computer and then regularly updates the time.
To retrieve the system time, use the Get System Time function.
You can, of course, still visit the Windows Update website yourself and check for any new patches.
Allow all users to install updates on this computer: Check this if you have other, non-administrator accounts on your computer that actually get used. However, even when unchecked, updates installed by an administrator will still get applied to those user accounts, they just won't be able to install them.
Give me updates for other Microsoft products when I update Windows: Check this option, which is a bit wordier in Windows 7 & Vista, if you own other Microsoft software and you want Windows Update to handle updating those as well.
Because the system time can be adjusted either forward or backward, do not compare system time readings to determine elapsed time.
Instead, use one of the methods described in Windows Time.