System installs AutoUpdate KB973688 Windows 7

Having a problem repeated with this installation. I get a: Code 643 Windows Update encountered an unknown error.  This applies also to the KB954430.

I met other info on this site to solve this problem, but so far without success. (

I read the article on this issue.  I downloaded the update and tried to install manually, but that has not worked.  The info said the press ignore, but I do not understand this option. The only option is an OK button how the installation rolls back.

I tried to update the windows update component using the "fixit" microsoft program, but I get the same error:

An error occurred during the installation of Assembly component {7B2B4EA5-1028-B7E6-A06B-D6B9ABF34537}.
HRESULT:0 X 80073712.

The Installer dialog box has the status as: publication of product information

I tried to uninstall the MSXML4 file by going to the Remove programs in the Control Panel, but it says there is no update on the computer.  Probably wiped out by one of the 'Cleaners' PC, I used (ccleaner and others).  Other than this problem, the machine IS updated and all other updates were installed successfully.

Also tried it with the firewall and antivirus disabled.

It is a machine age of six week Windows 7 64.

Any help is very appreciated!

Thank you!!

Well, the System File Checker would not run so it became obvious I had to reinstall windows.  Since I'm pretty good with my image backups, I rolled the system back to a few days before the first failure, updates.

Long story short - everything is working now and the updates installed without a hitch.  All updates now show in Add/Remove, so all is good!   Good backup saved my butt several times over the years!

Thanks for all the help!  Much appreciated!

Tags: Windows

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