Windows Update fails to install

every time I run windows update tells me that I have 11 important updates. I tried all 11 at one point, I tried two or three little at a time, I tried one at a time. Whenever they do not and the box of solution of the problem that appears gives me 1 result: "WindowsUpdate_00000646" and "WindowsUpdate_dt000".  I'm running Windows Vista Home Premium Service Pack 2 has been installed  Most of these 11 updates relate to various Microsoft Office 2007 programs. How can I possibly fix this? Help!  I am a student in full-time and I need my machine!

Hello

Please see the link following the detailed troubleshooting steps have been discussed to solve the problem.
http://social.answers.Microsoft.com/forums/en-us/vistawu/thread/6e716883-7af4-4A9F-8665-2f4dd57eee8d

It may be useful
Thanks and greetings
Support Microsoft-dieng
Visit our Microsoft answers feedback Forum and let us know what you think
http://social.answers.Microsoft.com/forums/en-us/answersfeedback/threads/

Tags: Windows

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      Note by default, the Windows distribution folder is located in the drive: \Windows\SoftwareDistribution folder. At this location, the drive is a placeholder for the drive where Windows is installed.

    5. Make sure that the Windows distribution folder is empty and enlarge the Services (local) window.
    6. In the Services (Local) pane, click Automatic updates, and then click Start.
    7. Restart the computer, and then run Windows Update again.

    Article number: http://support.microsoft.com/default.aspx/kb/822798

    (V) disable the security software

    (VI) SFC Run scan
    Please follow the steps below to the auditor of the filesystem as the first steps:

    1. Click Start and type cmd in the box start the search.

    2. in the area of results, right-click cmd.exe, and then click Run as administrator. You will be asked to type the password for an administrator account. If you are the administrator or type the administrator password, click on continue. Then click on continue.

    3. at the command prompt, type Sfc/scannow, and then press ENTER.

    Note: The scan may take a while, so be patient. Windows allows to fix corrupt or missing files it finds. If the information of the installation CD is required to fix the problem, you may be asked to insert your Windows Vista CD.

    Thank you and best regards,
    Abdelouahab

    Microsoft Answers Support Engineer

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