Windows Update is an Internet-based tool for locating and installing updates and enhancements to the Microsoft Windows 2000 and Windows 98 operating systems. Windows Update can be thought of as an online extension of Microsoft Windows, and is designed to help you get the most out of your computer.
You need to establish an Internet connection in order to use Windows Update. You open Windows Update by selecting its shortcut from the Start menu. This action starts Microsoft Internet Explorer and takes you to a page on the Web sitehttp://windowsupdate.microsoft.com. Note that you must be an administrator or a member of the Administrators group to access the Product Updates section of the Windows Update Web site. Once you have connected to the site, ActiveX controls scan your system for outdated system files and determine which new versions of these files should be installed. These system files can include drivers, patches, help files, or new Windows components you can download to keep your computer up-to-date.
You also have the option of restoring previous versions of system files that have been changed by Windows Update. To do this, start Windows Update, go to Product Updates, select Device Drivers, and click Restore.