Downloading updates have error message #646

I am trying to do updates on my computer and have had error message 646 come up everytime.  The last three updates I need to upload are as follows:

Update for Microsoft Word 2007 (KB974561)
Update for Microsoft Office Info Path 2007 (KB976416)
Security Update for the 2007 Microsoft Office System (KB973704)

These are Important updates

I have three that are Optional that I am having the same problem they are:

Windows Vista  -  LSI Network - LSI PCI-SV92PP Soft Modem
Office Live Add In 1.4
Windows Live Essentials

I would greatly appreciate your assistance with this. 


Question Info

Last updated March 25, 2018 Views 803 Applies to:

Try this 1st to see if it helps and it should :

Description of the Patch Registration Cleanup Tool


If needed :

Try this - Control Panel - Windows Updates - on each Update that will not install - Click the Important Updates
or the Update itself - double click one then click View More Informations (or click on it then View on right side)

Those will take you to a page where  you can download the update.

Or go here and put in the KBxxxxxx number to download it.

Download Center - put in the KBxxxxxx.

Microsoft Download Center

Download - SAVE - go to where you put them - Right Click on - RUN AS ADMIN

Then you can Right Click on the Update in Windows Updates and HIDE.

If you get an installer error install this version :

Windows Installer 4.5 Redistributable


Then run these :

How do I reset Windows Update components? - a Mr Fixit

Description of the System Update Readiness Tool for Windows Vista, for Windows Server 2008, and
for Windows 7

Since these are all Office Updates you might get more info if needed in Office Groups from those who
might have experienced the same issue.

Office Discussion Groups

Discussions in


If needed you can get free incident reports however the above should take care of it for you.

For Windows Updates - Free Incident Report

Go Here and Click -> Windows Update fails while scanning for, downloading, or installing updates

For Security Updates you can get a Free Support Incident Report

Hope this helps and Happy Holidays!

Rob - Bicycle - Mark Twain said it right.
Rob Brown - Microsoft MVP - Windows and Devices for IT 2010 - current
Windows Insider MVP 2016 - current

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