Ditto! I have the same problem and have tried at least all the steps that
others have tried (below).
Has anyone figured this out?? Please help.

Thanks!
"Wil" wrote:
> Microsoft .NET Framework 1.1 Service Pack 1 - Error Code: 0x643
>
> I'm getting same error here... any ideas as to why this error is occurring?
>
> "Bill Johnson" wrote:
>
> > I have tried 6 times now to install Microsoft.NET Freamwork 1.1 Service Pack
> > 1 and each time I do, I receive Error Code: 0x643.
> >
> > I have done the following:
> > 1. Uninstalled all .NET updates and the entire .NET Framework and
> > reinstalled the framework.
> > 2. Uninstalled the Windows Updater 3.1 and reinstalled it.
> > 3. Verified that my permsission are set to Full in the .NET configuration
> > tool accessed via the Control Panel.
> >
> > Does anyone have any other suggestion to get this update to install? The
> > only other idea that came to mind was IE is not set as my default browser but
> > I am not sure if that would be a factor. Any help is appreciated.