Installation of NET Framework Update Fails

I have been trying to install this update and it keeps failing. I have McAfee protection and I have tried to instal with it turned off and still no success. My computer tries to auatomatically install this everyday and it always fails.

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Product Update Status Date Source
Windows XP 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 Saturday, March 20, 2010 Microsoft Update
Windows XP 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 Saturday, March 20, 2010 Microsoft Update
Windows XP 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 Saturday, March 20, 2010 Automatic Updates
Windows XP 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 Thursday, March 18, 2010 Automatic Updates
Windows XP 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 Wednesday, March 17, 2010 Automatic Updates
Windows XP 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 Wednesday, March 17, 2010 Automatic Updates
Windows XP 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 Tuesday, March 16, 2010 Automatic Updates
Windows XP 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 Tuesday, March 16, 2010 Automatic Updates
Windows XP 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 Tuesday, March 16, 2010 Automatic Updates
Windows XP 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 Monday, March 15, 2010 Automatic Updates
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Last updated December 21, 2018 Views 15,090 Applies to:
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Answer

When installing updates using Windows update or Microsoft Update you may receive Error 0x643 or 0x80070643 (23 Oct-09)
http://support.microsoft.com/kb/976982

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

Step #1 => Before doing anything else, write down what .NET Framework versions are currently installed:

How to determine which versions of the .NET Framework are installed and whether service packs have been applied
http://msdn.microsoft.com/en-us/kb/kb00318785.aspx

Step #2 => Now see Resolution Method 2 in this related KB article: http://support.microsoft.com/kb/923100

After running the .NET Framework Cleanup Tool (not the Windows Installer Cleanup utility), reinstall all .NET Framework versions (but only the ones you wrote down in #1 above) manually using the download links on the page then run Windows Update manually to install security updates for same.

NB: If you remove .NET Framework 3.5 (SP1) using the tool, reinstalling .NET Framework 3.5 will also install .Net Framework 2.0 SP2 and 3.0 SP2; then Windows Update will offer .NET Framework 3.5 SP1.

IMPORTANT! => If you remove .NET Framework 3.5 (SP1), reinstall your .NET Framework versions in the following order:

    1. .Net Framework 3.5, then...
    2. .Net Framework 1.1, then...
    3. .Net Framework 1.1 SP1

NB: KB923100 references this page: http://blogs.msdn.com/astebner/archive/2006/05/30/611355.aspx.  Please read ALL of it as well as the related page http://blogs.msdn.com/astebner/pages/8904493.aspx before using the .NET Framework Cleanup Tool.

Step #3 => Check-in at Windows Update and install any critical security updates offered.


~Robear Dyer (PA Bear) ~ MS MVP (IE, Mail, Security, Windows & Update Services) since 2002 ~ Disclaimer: MS MVPs neither represent nor work for Microsoft
--
~Robear Dyer (PA Bear)
Microsoft MVP (Windows Client) since October 2002

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