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Error Code 66a error code is common for all the Windows Operating systems when you try to install the updates. It usually appears when Windows 10 or Windows 7 update system is broken or there is network related glitches.

Error Code 66a error code is common for all the Windows Operating systems when you try to install the updates. It usually appears when Windows 10 or Windows 7 update system is broken or there is network related glitches.

Usual causes for this Error Code 66a are communication failure over the internet with Microsoft update servers.

Firstly, I will suggest you to do Windows Troubleshoot for Error Code 66a.

After that,

Disable the proxy internet connection and try again to install the update.

The procedure to disable the proxy connection is as follows:

1. Open Internet Explorer and click on Tools->Internet Options
2. Goto Connections and LAN Settings
3. Check to make sure the Proxy server is disabled.