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. Some updates were not installed Error(s) found: Code 80070BC9 Windows Update encountered an unknown error.
- From the Microsoft Download Center, install the security update. If the error 80070bc9 pops up, close it.
- Download and install the standalone package from the following link: http://www.microsoft.com/en-us/download/details.aspx?id=3965
- After installing the standalone package, restart Antivirus, Firewall and other third party software.
- Click this link http://support.microsoft.com/kb/971058 to reset Windows Update Components.
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