Responsible for updating
System administrators can configure Windows Update to install critical updates automatically, so long as the computer has an Internet connection.Windows 95 and Windows NT 4 were retroactively given the ability to access the Windows Update website, and download updates designed for those operating systems, starting with the release of versions of Internet Explorer 4.The tool then compares this list with the list of installed updates on its machine and displays an update availability notification.Once the check is executed, any custom schedule defined by the user is reverted to the default. Moore in early 1999 was critical of this approach, describing it as "horribly inefficient" and susceptible to attacks.Enables the detection, download, and installation of updates for Windows and other programs.If this service is disabled, users of this computer will not be able to use Windows Update or its automatic updating feature, and programs will not be able to use the Windows Update Agent (WUA) API.
Service packs and feature updates are very large cumulative sets of updates that introduce new features or remove discontinued features.
Critical Update Notification Utility (initially Critical Update Notification Tool) is a background process that checks the Windows Update web site on a regular schedule for new updates that have been marked as "Critical". By default, this check occurs every five minutes, plus when Internet Explorer starts; however, the user could configure the next check to occur only at certain times of the day or on certain days of the week.
The tool queries the Microsoft server for a file called "", which contained a list of all the critical updates released for the operating system.
Windows Update is a Microsoft service for the Windows 9x and Windows NT families of operating system, which automates downloading and installing software updates over the Internet.
The service delivers software updates for Windows, as well as the various Microsoft antivirus products, including Windows Defender and Microsoft Security Essentials.