I had the same issue. There is another post on this site that helped me, Re:
problem with install of KB886903 -it has a date of 2/15/05. I wound up
getting back to net framework 1.0, updating to 1.1, but not the update;
installed the rollup 2 for MCE and the update to rollup 2; then installed the
KB886903 (knock on wood, it is working).
"Nikhil" wrote:
> I have been trying to install this update for quite some time, but it doesent
> seem to work! The result is Error Code: 0x643 Try to install the update
> again, or request help from one of the following resources.
>
> My computer is extremely new and runs Windows XP Media Center Edition 2005.
> Are their any known issues with this update on this edition of Windows XP.
>
> Since this update was related to .NET Framework, I tried to uninstall it but
> it does not allow me to - it throws another error.
>
> Any help will be very useful. Thanks!
>
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