It is important to keep your Windows updated in order to prevent your Windows inflected by Viruses. So, when Microsoft launch new critical updates, we need to update to prevent the threat.
But every time when we install Windows, we need to install all the updated Windows update. It will take a lot of time to update it. This problem can be eliminate by using software called Windows Update Downloader (WUD).
WUD allow us to download all the updates and save it on your Hard drive. Therefore, you no need to download all the update again when u reinstall your operation system. You just use back the updated update and install it.
Click Here to download the Windows Update Downloader.
After dowonload WUD, just double click to install it. But WDU require you to install .Net 2.0 framework, if you do not install .Net 2.0 framework, the installer will automatically redirect you to Microsoft download site to download it.

Once you finished install WUD, you requirer to download Update Lists to get the latest update. You can go to the WUD official web site to get the latest Update Lists or click Here download it.

After download the Update Lists, just double click it and you will see all the available update appear on WDU. You just select the update from the list and click update to download the latest update.