When attempting to install Windows Updates, your computer may show the Windows Update error 80070bc9 like the following message:

How to fix Windows Update error 80070BC9

Some updates were not installed Error(s) found: Code 80070BC9 Windows Update encountered an unknown error.
The above error is often caused by corrupted Microsoft.net framework. If you want to fix it, follow the steps below: Close all the antivirus, firewall and other third party software.
  1. From the Microsoft Download Center, install the security update. If the error 80070bc9 pops up, close it.
  2. Download and install the standalone package from the following link: http://www.microsoft.com/en-us/download/details.aspx?id=3965
  3. After installing the standalone package, restart Antivirus, Firewall and other third party software.
  4. Click this link http://support.microsoft.com/kb/971058 to reset Windows Update Components.

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