Error Code: 643 (Can't install KB951847)

Anonymous
2009-07-11T17:08:52+00:00

I cannot install update "Microsoft .NET Framework 3.5 Service Pack 1 and .NET Framework 3.5 Family Update (KB951847) x64". Windows Update encounters a reportedly unknown error code 643 and the update fails.

How can I fix this?

PS: I am running Microsoft Windows Vista 64-bit (ENU) with Service Pack 2 (SP2) on an HP Pavilion dv5-1199eg Entertainment Notebook PC.

Windows for home | Previous Windows versions | Windows update

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Anonymous
2009-10-19T20:38:52+00:00

I received the following Microsoft fix today.

I have been receiving instructions from a Microsoft Tech since last Thursday.

Some of you are likely seeing a Windows Update icon in your system tray right now. DONOT download those updates until you have done the following listed below.

Be sure to follow the instructions carefully. This fix repaired my problem and I was able to download all the new .net framework security updates successfully.

This applies to those using Windows XP and it repaired the problem:

I understand that the following 2 updates still cannot be installed. The error code 0x645 is received.

Microsoft .NET Framework 2.0 Service Pack 2 Security Update for Windows 2000, Windows Server 2003, and

Windows XP (KB974417)

Microsoft .NET Framework 3.5 Service Pack 1 and .NET Framework 3.5 Family Update for .NET versions 2.0 through 3.5 (KB951847) x86

In order to narrow down the cause of this issue and resolve it, please refer to the following steps.

Step 1: Use .Net Framework CleanUp Utility

============================================

  1. Please download the .NET Framework Cleanup Tool from the following link:

http://windowsuu.com/tools/dotnetfx\_cleanup\_tool.zip

Please Note: Microsoft provides third-party contact information to help you find technical support. This contact information may change without notice. Microsoft does not guarantee the accuracy of this third-party contact information.

  1. Unzip the file and then close all the open windows.
  2. Double click Cleanup_tool.exe to run it, and then select the .Net Framework 2.0 in the list box. Click “OK”, click “Yes”, and click “Cleanup Now” to remove it completely. After that, please also remove the .NET 3.5.

Step 2: Reinstall .NET Framework Version 2.0, 3.5 and their updates

==================================================

Please download and install the following updates in order.

Microsoft .NET Framework Version 2.0 Redistributable Package (x86)

http://download.microsoft.com/download/5/6/7/567758a3-759e-473e-bf8f-52154438565a/dotnetfx.exe

Microsoft .NET Framework 2.0 Service Pack 2

http://download.microsoft.com/download/c/6/e/c6e88215-0178-4c6c-b5f3-158ff77b1f38/NetFx20SP2\_x86.exe

Microsoft .NET Framework 2.0 Service Pack 2 Security Update for Windows 2000, Windows Server 2003, and Windows XP (KB974417)

http://download.microsoft.com/download/A/0/1/A01064A3-CAB0-4851-9C54-56A980FF00EB/NDP20SP2-KB974417-x86.exe

After that, please restart the computer and then install Microsoft .NET Framework 3.5 and its update.

Microsoft .NET Framework 3.5 and .NET Framework 3.5 Service Pack 1

http://download.microsoft.com/download/2/0/E/20E90413-712F-438C-988E-FDAA79A8AC3D/dotnetfx35.exe

Microsoft .NET Framework 3.5 Family Update

http://download.microsoft.com/download/C/6/A/C6ADC586-2518-404B-8973-E1E22C556AF4/NDP35SP1-KB958484-x86.exe

Note: When the file download window appears, please click "Save", and follow the directions to save it on the Desktop. After downloading the setup file on your Desktop, double-click to manually install it.

However, if any error is encountered when installing, please capture a screenshot of the error message:

How to capture a Screenshot:

======================

  1. When the error appears, please press the "Print Screen" key (PrtScn) on your keyboard.
  2. Click "Start", click "Run", type MSPAINT, and click "OK".
  3. In Paint, click "Paste" under the "Edit" Menu, click "Save" under the "File" menu, type a file name for the screenshot, choose JPEG as "Save as type", click "Desktop" on the left pane, and click "Save".
  4. Please find the screenshot on the Desktop and send it as an attachment to: *** Email address is removed for privacy ***.

Please try my suggestions and let me know the results at your earliest convenience. If you have any other questions, please do not hesitate to let me know.

I look forward to your response.

Best Regards,

William Zhao

*** Email address is removed for privacy ***

Microsoft Windows Update Support Professional

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  1. Anonymous
    2009-11-29T21:34:17+00:00

    Ok, so does anyone have a suggestion for a 32 bit system? i have tried all of the above suggestions that are relevant to my system.

    i have a 32 bit vista home premium on a dell computer.

    has anyone figured out what else can be done to get these service packs to install properly.

    i still have an empty windows features box, so i cant turn off my windows features to do an in place upgrade.

    I suggest you (and everyone else for whom the above-mentioned steps do not fix the issue) to contact a Microsoft support professional by e-mail using the following link: https://support.microsoft.com/oas/default.aspx?&c1=509&gprid=6527&&st=1.

    Good luck and please keep us posted.

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  2. Anonymous
    2009-11-29T20:31:54+00:00

    Ok, so does anyone have a suggestion for a 32 bit system? i have tried all of the above suggestions that are relevant to my system.

    i have a 32 bit vista home premium on a dell computer.

    has anyone figured out what else can be done to get these service packs to install properly.

    i still have an empty windows features box, so i cant turn off my windows features to do an in place upgrade.

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  3. Anonymous
    2009-11-29T14:41:15+00:00

    I HAD THE EXACT SAME PROBLEM AND WAS GOING NUTS!  I also am rumming Windows Vista 64bit on an HP Pavillion (desktop)... TRY THIS and I hope it works for you as well as it worked for me.

    1.)

    At "Start"  type:  "regedit"

    click on:  HKEY_LOCAL_MACHINE

    Click on:  SYSTEM

    Click on: CurrentControlSet

    Click on:  Services

    Click on:  MSIServer

    Right Click on:  WOW64

    Select:  Modify

    Change the value data from "1" to "0"

    2.)

    At "Start" type:  "run"

    Type:  "services.msc"

    go to:  "Windows Installer" and stop and start the program.

    Now reboot your computer and once it's up and running go straight to the updates and try to install your updates.

    Best of Luck! Hope it runs as well for you as it did for me and seveal others.

    YOU GENIUS!!! This one has been driving me nuts for months! As you will gather, it worked for me [Vista Home Premiun x64 on a P5K Premium Motherboard] THANK YOU!!

    Now, any ideas for:-

    Update for Windows Vista for x64-based Systems (KB976098)

    Error details: Code 80073712

    ???????????????

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  4. Anonymous
    2009-11-29T02:35:29+00:00

    I cannot install update "Microsoft .NET Framework 3.5 Service Pack 1 and .NET Framework 3.5 Family Update (KB951847) x64". Windows Update encounters a reportedly unknown error code 643 and the update fails.

    How can I fix this?

    PS: I am running Microsoft Windows Vista 64-bit (ENU) with Service Pack 2 (SP2) on an HP Pavilion dv5-1199eg Entertainment Notebook PC.

    Was this answer helpful?

    0 comments