KB2468871 System Update Install Error! (error 643)

Thank you.  I, too, had been annoyed with this particular update issue for a few months.  I even took my computer to the "shop" for expert attention.  Although they fixed a few other minor issues, they were unable to get the KB2468871 update to load.  This solution of yours worked for my computer.  Thanks, again.

You are SO awesome!!  I have been fighting with this update for three weeks!  Microsoft's so-called "technical help" center said my problem was my antivirus and registry and for a small fee of $99 per computer (I have two - however one didn't have problems but they said they needed to update it anyway) they would fix the problem.

Thank you so much for this advice and instruction.  You are truly an asset to the Help Community.  I will be passing this information on via a link to your post.

Thank you, Thank you, Thank you, Thank you, Thank you, Thank you, Thank you, Thank you, Thank you, Thank you, Thank you, Thank you, Thank you, Thank you, Thank you, Thank you, Thank you, Thank you, Thank you, Thank you, Thank you, Thank you, Thank you, Thank you, Thank you, Thank you, A thousand times, Thank you!!!!!

Oh thank you so much! I had the same issue keeping me frustrated for a couple of days.

Your hint SOLVED the problem!!!

Best regards

Peter

Finally after weeks of frustration I was able to fix this mess, none of the advice microsoft provided worked, uninstalling reinstalling, using microsoft .net removal tool, microsoft fixit, disabling UAC, and numerous other things which did nothing at all.

The source of this problem with KB2468871 is that a .dll needed for it to install is not present for whatever reason, copying and inserting the .dll where it needs to be will allow you to install this update.

Download the KB2468871 update here:

http://www.microsoft.com/download/en/details.aspx?id=3556

Try to install it, so that it extracts the needed .dll

C:\Windows\Microsoft.NET\assembly\GAC_MSIL\System.Xml.Serialization\v4.0_4.0.0.0__b77a5c561934e089

Go to there and you should see the .dll file "System.Xml.Serialization.dll" If you can't find it do a search for it.

Copy it.

Paste it here C:\Windows\Microsoft.NET\Framework\v4.0.30319

And paste it here:

C:\Windows\Microsoft.NET\Framework64\v4.0.30319

Install the KB2468871 update you downloaded earlier.

Thank you.  After days of frustration you were the only one to give me a successful solution to my problem.