I try to update and get an error code 643.

Failed to update code 643 for microsoft .net framework 3.5 service pack 1 and the .net framework 3.5 family update (KB951847) x 64 - I have vista - help advice would be welcome.  I used the tool fixit - no luck.

First run the difficulty in this article & see if the update will install after doing:

How to fix MSI software update registration corruption issues
http://support.Microsoft.com/kb/971187

If no joy, see...

When installing updates using Windows update or Microsoft Update you may receive error 80070643 0 x or 0 x 643 (23 Oct-09)
http://support.Microsoft.com/kb/976982

Then proceed with the following text:

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

Step #1 => foremost, note what version of .NET Framework is installed:

How to determine what version of the .NET Framework is installed and determine whether the service packs have been applied
http://msdn.Microsoft.com/en-us/KB/kb00318785.aspx

Step #2-online now see resolution method 2 in this related KB article: http://support.microsoft.com/kb/923100

After you run the cleanup tool of .NET Framework (not the Windows Installer Cleanup utility), reinstall all the versions of the .NET Framework (but the ones you noted in #1 above) manually using the download links on the page, and then run Windows Update manually install security updates for same.

NB: If you remove the .NET Framework 3.5 (SP1) by using the tool, reinstall .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 the .NET Framework 3.5 (SP1), reinstall your version of .NET Framework in the following order:

1. the .net framework 3.5, then...
2 .net framework 1.1, then...
3 .net framework 1.1 SP1

NB: KB923100 makes reference to this page: http://blogs.msdn.com/astebner/archive/2006/05/30/611355.aspx.  Please read ALL as well as the related http://blogs.msdn.com/astebner/pages/8904493.aspx before using the .NET Framework cleanup tool.

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

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

What to do if other .NET Framework configuration troubleshooting procedures do not help:
http://blogs.msdn.com/astebner/archive/2008/03/07/8108332.aspx

~ Robear Dyer (PA Bear) ~ MS MVP (that is to say, mail, security, Windows & Update Services) since 2002 ~ WARNING: MS MVPs represent or work for Microsoft

Tags: Windows

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