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Windows 7: Error installing KB973923

05 Oct 2009   #1

Windows 7 Build 7100
Error installing KB973923

Good morning,

I get Error Code 643 when trying to install the Security Update for Microsoft Visual C++ 2005 Service Pack 1 Redistributable Package, here are the details from the failed attempt:

Security Update for Microsoft Visual C++ 2005 Service Pack 1 Redistributable Package (KB973923)

Installation date: ‎10/‎5/‎2009 8:47 AM

Installation status: Failed

Error details: Code 643

Update type: Important

A security issue has been identified that could allow an attacker to compromise 
your Windows-based system with Microsoft Visual C++ 2005 Service Pack 1 
Redistributable Package and gain complete control over it. You can help protect 
your computer by installing this update from Microsoft. After you install this item, 
you may have to restart your computer.

More information:

Help and Support:
I first tried using the Windows Install Cleanup Utility and reinstalling the redistributable and service pack manually but it didn't help. I then talked to the free support and they pointed me here.

Any help would be appreciated.


My System SpecsSystem Spec
26 Sep 2010   #2

Windows 7 Ultimate x64

Sorry for the thread necromancy but I recently had this problem and fixed the issue by having to amend permissions for the following registry key:


by making sure Creator/Owner inherited the permissions from Administrator.
My System SpecsSystem Spec
26 Sep 2010   #3
A Guy

Microsoft Community Contributor Award Recipient

Windows 7 Home Premium x64 SP1

Welcome to Seven Forums WastedJoker. While this was an old post, we appreciate you sharing your fix. Should anyone come here looking for a fix to a sililar problem, I would suggest starting with the following steps before resorting to changing registry permissions.

You receive error code 0x80070643 or error code 0x643 when you use the Windows Update or Microsoft Update Web sites to install updates

If this doesn’t help, then try running patch registration cleanup tool

Description of the Patch Registration Cleanup Tool

After this, reset Windows Update components from the link below or Run the fix it to automatically scan and fix the issue.

How do I reset Windows Update components?

A Guy
My System SpecsSystem Spec


 Error installing KB973923

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