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how do i fix windows install error 645 for Vista RRS feed

  • Question

  • i have a security update for Vista that when i try to install it i get error code 645 windows encountered an unknown error, now i am not to savvy with computers so if some one could help me i would really appreciate it!!!
    • Moved by Carey FrischMVP, Moderator Monday, November 22, 2010 2:03 AM Moved to appropriate forum category (From:Windows Vista Validation Issues (Windows Vista))
    Monday, November 22, 2010 12:06 AM

Answers

All replies

  • I recommand to you to download and install "System Update Readiness Tool for Windows Vista".

    http://support.microsoft.com/kb/947821/en

    Download and run the tool, it will say that it's "installing"...it's actually running the readiness scan at this time so you should let the installation run to completion. The KB article says it will appear to hang at 60% completion and I've observed this as well. Just be patient and let it finish. After the "installation" is completed, try to download and install your security update.

    If this does not solve your problem, please reset windows update components:

    http://support.microsoft.com/kb/971058


    If this does not solve your problem, please post your question in the dedicated  Windows Update Forum.

    http://social.answers.microsoft.com/Forums/en-US/vistawu/threads

    Thank you for your cooperation!


    This posting is provided "AS IS" with no warranties or guarantees , and confers no rights.
    • Proposed as answer by Sabrina Shen Tuesday, November 23, 2010 8:36 AM
    • Marked as answer by Sabrina Shen Monday, November 29, 2010 2:48 AM
    • Unmarked as answer by Sabrina Shen Friday, January 14, 2011 5:53 AM
    Monday, November 22, 2010 8:21 AM
  • Hi,

     

    If the above suggestions doesn’t work, please let me know the name of the update which failed to install for further research.

     

    Regards,

     

    Sabrina


    This posting is provided "AS IS" with no warranties or guarantees, and confers no rights. |Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.
    Tuesday, November 23, 2010 8:36 AM
  • I tried the fix above and it is not working. I have just ignored this important update for several months but would like to fix it. I'm getting the Code 645 Error with the KB2416473.

    Security Update for Microsoft .NET Framework 3.5 SP1 on Windows XP, Windows Server 2003, Windows Vista, Windows Server 2008 for x64-based Systems (KB2416473).

    OS Name Microsoft® Windows Vista™ Home Premium
    Version 6.0.6002 Service Pack 2 Build 6002
    System Type x64-based PC

    Thanks for any help you can offer.

    Dexter

    Friday, January 14, 2011 4:55 AM
  • Hi Dexter,

     

    This issue can be caused by a damaged .NET Framework component. You may refer to the following KB articles to have a test:

     

    When you try to install an update for the .NET Framework 1.0, 1.1, 2.0, 3.0, or 3.5, you may receive Windows Update error code "0x643" or Windows Installer error code "1603"

     

    MS10-070: Description of the security update for the Microsoft .NET Framework 1.1 Service Pack 1 on Windows XP, Windows Server 2003 (64-bit), Windows Vista, and Windows Server 2008

     

    Regards,

     

    Sabrina


    This posting is provided "AS IS" with no warranties or guarantees, and confers no rights. |Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.
    • Marked as answer by Sabrina Shen Tuesday, February 8, 2011 2:14 AM
    Friday, January 14, 2011 5:55 AM
  • What worked for me was using the .Net Framework "Repair" option in Programs and Features.  Double click the .Net Framework Client entry, then choose "Repair".  Reboot after it's done; If you have multiple versions of the .Net Client do the repair on each of them, rebooting after each repair.  Once all repairs are complete run Windows Update and it should run without error- It did for my Vista Business SP2 laptop.
    Thursday, January 12, 2012 4:48 AM
  • Hi,

    I did exactly what you suggested (unfortunately none of the above solutions worked) and it smoothely solved the problem. Thanks for the great idea, it was brilliant :-).

    Agnes

    Friday, June 21, 2013 10:07 PM