If a Windows update fails to install automatically, the problem can often be cured by going to Microsoft's website and installing the update yourself
From time to time I have problems with individual updates for Windows. Every time I shut down Windows it tries to install the update but it’s still there next time I use the computer.
Advice from Microsoft is usually to try again and then again in Safe Mode. I have found a solution to this problem by downloading and installing the update myself.
Go to the Microsoft Support home page and click in the search box at the top of the page. Enter the update reference number, such as KB976932 for Windows 7 Service Pack, and press enter.
The top result should be the article about that update. The address will use the number, for example http://support.microsoft.com/kb/976932. The article will include any updates for known problems and their fixes.
The page will often have a link to download the update. Once it has downloaded, right-click on it and select Run as Administrator. Enter your details for User Account Control and the update should run.
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