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From: PA Bear [MS MVP] on 11 Jun 2010 17:39
[Crosspost to Windows Update newsgroup]

OPTION A: See the "How to obtain help" section of
http://support.microsoft.com/kb/979906

For home users, no-charge support is available by calling 1-866-PCSAFETY
(1-866-727-2338; 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., KB979906).

Or you can...

Start a free Windows Update support incident email request:
https://support.microsoft.com/oas/default.aspx?gprid=6527

Customers who experience issues installing Microsoft security updates also
can visit the following page for assistance:
https://consumersecuritysupport.microsoft.com/

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.

==================================

OPTION B: First run the Fix It in this KB article & see if the update will
install after doing so:

How to fix MSI software update registration corruption issues
http://support.microsoft.com/kb/971187

If no joy, see...

When installing updates using Windows update or Microsoft Update you may
receive Error 0x643 or 0x80070643 (23 Oct-09)
http://support.microsoft.com/kb/976982

Then proceed per the following:

~~~~~~~~~~~~~~~~~~~~~~~~

Step #1 => Before doing anything else, write down what .NET Framework
versions are currently installed:

How to determine which versions of the .NET Framework are installed and
whether service packs have been applied
http://support.microsoft.com/kb/318785

Step #2 => Now see Resolution Method 2 in this related KB article:
http://support.microsoft.com/kb/923100

After running the .NET Framework Cleanup Tool (not the Windows Installer
Cleanup utility!), reinstall all .NET Framework versions (but only the ones
you wrote down in #1 above) manually using the download links on the page
then run Windows Update manually to install security updates for same.

Download links for .NET Framework Cleanup Tool:

•
http://cid-27e6a35d1a492af7.skydrive.live.com/self.aspx/Blog_Tools/dotnetfx_cleanup_tool.zip

•
http://blogs.msdn.com/cfs-file.ashx/__key/CommunityServer-Components-PostAttachments/00-08-90-44-93/dotnetfx_5F00_cleanup_5F00_tool.zip

NB: If you remove .NET Framework 3.5 (SP1) using the tool, reinstalling .NET
Framework 3.5 will also install .Net Framework 2.0 SP2 and 3.0 SP2; then
Windows Update will offer .NET Framework 3.5 SP1.

IMPORTANT! => If you remove .NET Framework 3.5 (SP1), reinstall your .NET
Framework versions in the following order:

1. .Net Framework 3.5, then...
2. .Net Framework 1.1, then...
3. .Net Framework 1.1 SP1

NB: KB923100 references this page:
http://blogs.msdn.com/astebner/archive/2006/05/30/611355.aspx. Please read
ALL of it as well as the related page
http://blogs.msdn.com/astebner/pages/8904493.aspx before using the .NET
Framework Cleanup Tool.

Step #3 => Check-in at Windows Update and install any critical security
updates offered.
--
~Robear Dyer (PA Bear)
MS MVP-IE, Mail, Security, Windows Client - since 2002


CK wrote:
> The automatic security download from Microsoft has tried several times to
> download Microsoft .NET Framework 1.1 SP1 Security Update for Win2000 and
> WinXP KB979906 and the installation has failed. Error code is O or 0x643.
>
> I am using WinXP Home Edition, Ver 5.1 and SP3. No help from MX on-line
> do-it-yourself stuff. Not sure what to do next. Any help or suggestions?

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