If you don’t know the answer to that, you should — Windows Update keeps Windows, Internet Explorer, and Microsoft Office up-to-date with the latest security patches and bug fixes The code that makes up the Windows operating system contains security loop holes, errors, incompatibilities, or outdated software elements. Security patches and updates fix the vulnerabilities..., ensuring your computer is as secure as possible.
But, as we all know, once in a while we have to find the old Windows installation CD/DVD and reinstall the entire operating system.
For more detailed instructions please refer to the documentation that accompanied your operating system.
To check if you have IIS installed check if Internet Information Services is available in Administrative Tools from the Control Panel.
Win Updates List displays the list of all Windows updates (Service Packs and Hotfixes) installed on your local computer.
For hotfix updates, this utility also displays the list of files updated with these hotfixes.