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":
http://support.microsoft.com/kb/923100
1. Before doing anything else, write down the .NET Framework versions which
are already installed:
How to determine which versions of the .NET Framework are installed and
whether service packs have been applied
http://support.microsoft.com/kb/318785
2. Now see Resolution Method 2 in
http://support.microsoft.com/kb/923100
(ignore the title). After running the appropriate/needed tool, (re)install
all .NET Framework versions manually using the download links on the page.
--
~Robear Dyer (PA Bear)
MS MVP-IE, Mail, Security, Windows Client - since 2002
dolphin wrote:
> I've tried installing this priority update several times and get the same
> failure error. I'm running WinXP W/sp3. The following failure information
> was taken from the "WindowsUpdate.Log". The Windows Defender updated
> successfully prior to this one failing.
>
> Failure Content Install Installation Failure: Windows failed to install
> the
> following update with error 0x80070643: 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.