From: bkmmd on
Here's what works for me, and how I got there. Note that I'm a mac user, and
don't have the patience for the long drawn up fixes.

A long time ago, I ran into a similar problem. An old version of Norton
Utilities found a several missing files in the .Net installations. I copied
these files from backups, ran the updaters, and everything seemed to work. I
also saved a copy of the missing files in case the problem recurred. It did.

This time around, here's what was missing from my installation:

In the past, other files that have disappeared include

After copying these files over, I ran Windows update, and the patch worked
this time.

Your results may vary.

"sherlockomes" wrote:

> Running : Windows XP media center edition SP3
> Have tried installing KB979906 a few times and also downloaded update
> manually but cannot install this update. Receiving error 0x643.Is it safe to
> uninstall the .NET Framework 1.1 and re-install as possibly corrupt , without
> having to uninstall/re-install all other .NET frameworks 2 , 3 and 3.5
> including the updates that go with them? ..