Windows Update is the online extension of Windows that helps you to keep your computer up-to-date. Use Windows Update to choose updates for your computer’s operating system, software, and hardware. New content is added to the site regularly, so you can always get the most recent updates and fixes to protect your computer and keep it running smoothly.

1. Go to the site http://v4.windowsupdate.microsoft.com/en/default.asp.
2. Click on the "Scan for Updates" link (this may take a few minutes).
3. A list of updates will appear. Click the "Add" button next to each update.
4. Click the “Review and Install updates” link.