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.
Disable the proxy internet connection and try again to install the update.
The procedure to disable the proxy connection is as follows:
Second case would be with your Antivirus. There are proxy settings enabled under your settings of any security programs that you may be using. If you cannot find the procedure to stop it, you can ask our techs on chat support to guide you.
There are failed windows update services that could also cause you this Error 66a while updating Windows.
Repairing Windows update services is not possible like you repair any windows apps from the add/remove programs. There is a procedure that you need to follow through command lines.
This requires the user to have administrator rights on his computer. As per the Microsoft set of rules defined on various Knowledge base articles, the steps are simplified as mentioned here to reset your windows update services.
SFC SCAN is the command line that we use to do this process. I will explain you the steps in detail on how to perform this scan.
This process may result positive note saying all the issues are resolved and the flip side the negative result could be that your windows is corrupted.
In this case, you should really work hard to reinstall windows operating system.
Backing up data is the foremost important thing in order to make sure you won’t lose your personal files.
If you have troubles in doing this method, we advise you to choose a Technical Support from us to help you better.
We have many users who got it resolved in their first attempt with us and had given many positive feedbacks and star ratings for this article.
And I am sure any disaster that would have happened for few are due to their system hardware dependencies. An old computer which got upgraded from XP to 10 or 7 to 10 is certainly not compatible for this programs. It is just a fluke to get such issues as 1 in 100.
We give you assurance about your money and the service. If you like to see the procedure for a paid support, you may ask the Tech available online here on this page.