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Error Code 646 on MS Office Updates Only

Windows Update

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Old 13-05-2010
Posts: n/a
Error Code 646 on MS Office Updates Only

I have now accumulated 5 updates which repeatedly fail. They are:

KB978382 - Excel 2007
KB976321 - Office 2007
KB978380 - Office 2007
KB980729 - OneNote 2007
KB981715 - Office 2007

OS (Windows 7) updates seem to install correctly, as do updates for any

Have tried both auto and manual update installs .... have tried one at a
time and all at once ... Nothing seems to correct the situation. Any ideas?

Any ideas?

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Old 13-05-2010
Peter Foldes
Posts: n/a
Insert your Office CD into your computer while the Updates are trying to install. If
you have read some of the posts here ,then you would have found the above fix for
the 646 issue

Close all Office applications prior to the next install attempt.

Insert your Office 2007 into the appropriate drive-bay prior to the
next install attempt.

Temporarily disable any third-party real-time system protections (e.g.,
anti-virus; anti-spyware; firewall) prior to the next install attempt.

Reboot after an install attempt, whether prompted to do so or not.
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Old 13-05-2010
PA Bear [MS MVP]
Posts: n/a
Tip: Insert your Office CD into the appropriate drive bay before the next
installation attempt.

Tip: If no joy, see if you can download the "fullfile" version of the
and install it/them manually; e.g.,

Or you can...

See the "How to obtain help" section of, e.g.,

For home users, no-charge support is available by calling 1-866-PCSAFETY
(and/or 1-866-234-6020 and/or 1-800-936-5700) in the United States and in
Canada or by contacting your local Microsoft subsidiary. There is no-charge
for support calls that are associated with security updates. When you call,
clearly state that your problem is related to a Security Update and cite the
update's KB number (e.g., KB976321).

Or you can...

Start a free Windows Update support incident email request:

Customers who experience issues installing Microsoft security updates also
can visit the following page for assistance:

For more information about how to contact your local Microsoft subsidiary
for security update support issues, visit the International Support Web
site: http://support.microsoft.com/common/international.aspx

For enterprise customers, support for security updates is available through
your usual support contacts.
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Old 14-05-2010
Posts: n/a
Re: Error Code 646 on MS Office Updates Only

Everyone only offers to insert your Office 2007 CD into the drive. In August
2009 when the computer shop built my computer, Microsoft was not providing
the CDs any longer. They were required to purchase Office 2007, obtain the
key code, and then download directly from Microsoft website. I don't have
physical CD's for my Office 2007 Professional version because Microsoft
stopped providing them. Only direct download from website.

My fiancee is computer IT person. she said when she gets those errors she
ignores them and eventuall the Windows Update program will work properly and
the icon in the system tray will go away.
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Old 14-05-2010
Posts: n/a
No, the shop chose not to burn a CD.

[Hope you fiancee can find a job & keep it.]

Go to the Control Panel, click on User Accounts and turn it off. You'll have
to restart your computer, then install the updates. Once installed, go back
to the Control Panel and turn the User Accounts back on. It has worked for me
every time an Office 2007 update has failed.
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Old 18-05-2010
Join Date: May 2010
Posts: 1
Re: Error Code 646 on MS Office Updates Only

INSTALLATION SUCCEEDED!! Thank you! I turned off the user account , and also inserted the CD for office. First, i inserted CD then tried to install but failed. With the user account "Off", then it worked.
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