If you are having issues with Windows Update, particularly having the installation of updates constantly failing, you can try the following fix:
- Download this file  to your desktop.
- Double-click the file to run it.
- You will be notified when the process completed.
This fix is the first step to fixing general problems with Windows Updates, if you continue to have problems after performing these steps, or if you receive a specific error message, you should search Google for more specific help.