error code 646 KB2288931 and KB2431831 installation

My computer fails to install 2 updates: security update, for Microsoft Office System 2007 (KB2288931) and update of security for Microsoft Works 9 (KB2431831) it displays error code 646.  What can I do?  I saw the update history and it lasts for several weeks.  Whenever I stop, it tries to install updates two same in vain.  I used the tool troubleshooting, but in vain.  Help!

Read the following article about your error:

http://support.Microsoft.com/kb/2258121>

Tags: Windows

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