Why does my critical windows update keep failing?

Question

How do i fix this ? Security Update for Microsoft .NET Framework 4 on XP, Server 2003, Vista, Windows 7, Server 2008, Server 2008 R2 for x64 (KB2840628)

Installation date: ‎12/‎07/‎2013 03:21

Installation status: Failed

Error details: Code 643

Answer 1

Hi Bareback,



This issue may occur if the MSI update registration has become corrupted, or if the .NET installation on the computer has become corrupted. This may happen due to several possible reasons. You may follow the troubleshooting steps below:



1) Repair .NET Framework installation: You may try the suggested steps from the following link:



http://bit.ly/d0dTfk



2) Reset Windows update components: You may try to reset the Windows update components by following the steps from link below:



http://bit.ly/QrAS8



3) Install from Microsoft Download center: Download and install the standalone package of the updates from the Microsoft download center. You may follow the steps below:



• Download updates from Microsoft download Center: http://bit.ly/O0hxq

• Enter the KB article number in the search field and download the same.

• Double click on the downloaded file.

• And Click Run and Follow the wizard to install it.



4) If the issue persists, you may delete the contents of 'Software Distribution Folder' (this will lead to the deletion of complete Windows update history) which automatically rebuilds itself with subsequent Windows updates.



You may follow the steps below:



Open the Command Prompt window by clicking the Start button > All Programs > Accessories > Right click Command Prompt and run as administrator. Type the commands below:



net stop wuauserv

del c:\windows\SoftwareDistribution /q /s

net start wuauserv



Hope this helps.



Thanks and Regards,

Chinmay S

Answer 2

Windows Updates Keep Failing

Answer 3

Error Code 643----UPDATE NOT NEEDED

Right click on update, choose Hide Update, issue resolved



Believe somebody needs to go back to school

Answer 4

I normally search the microsoft support site to fix these types of problems but they don't seem to have this one on file at the moment. Sometimes if you wait long enough it will resolve itself but it can also be problematic in holding up other subsequent updates. It's normally caused by another update installing out of sequence or simply a bug in Microsofts programming.



Try this automated Microsoft program, sometimes it does wonders sometimes it doesn't. It's definitely worth a go:



http://support.microsoft.com/mats/windows_update/

Answer 5

Well

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I hope it helps

Answer 6

Follow the instructions in this Microsoft article:-