If you are getting “Error number: 0×80072F76″ when you try to use Windows
Update, and you are using Zone Alarm, all you need to do is the following:

1. Open Zone Alarm and click the “Privacy” tab.

2. Turn off ALL privacy options! Yes ALL of them! ( The slider bars for
“Cookie Control” and “Add Blocking”, should say: “Off” and the “Mobile Code
Control” radio buttons should be set to “Off”) You may need to open the
“custom” options and uncheck them all manually.

3. Refresh the Windows Update page that was showing you the error, and
everything will show up like it should!

Why does this happen???

Zone Alarm uses a JavaScript “LoopBack Adapter” CGI filter to control all
privacy settings/behavior, and this majorly screws up Windows Update (as well
as the JavaScript of many other sites -though not usually as drastically).
ALL Zone Alarm “Privacy” options MUST be turned off before Zone Alarm will
stop filtering JavaScript in this way (using the CGI Loop-Back).

When Zone Alarm is filtering using the CGI Loop-Back, JavaScript that would
normally be processed as something like:
http://update.microsoft.com/windowsupdate/v6/shared/js/tgar.js?632681379147477303

Becomes something like:

http://127.0.0.1:1025/js.cgi?pa&r=11323