For XP they are 2 o 3 solutions, here is two of them
Dial-ª-Fix
Go ahead and download Dial-ª-Fix.
<http://wiki.djlizard.net/Dial-a-fix>
Scroll down about 2/3 of the way to Download Dial-ª-fix
Click the Double green checkmark and click Go.
After it has finished, Reboot
Try Windows Update and see if you can get your updates installed.
OR
You might want to try Eddie Bowers tool:
<www.codeplex.com/aureset>
Let us know what hªppens.
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"Phloss" wrote:
> I have recently found it necessary to return my computer back to its factory
> settings and have ran windows update to download all the necessary security
> fixes. Upon doing so, I have had to install SP3 along with a few other
> security fixes.
>
> I have now got the computer working again except for a couple of issues that
> have arisen: The automatic updates are no longer beginning installation after
> downloading the file; and I keep getting an explorer window for acrobat.com
> appearing on reboot.
>
> I have tried to update via the windows update site and get the same message
> to say that the installation has failed. There is no error message other than
> a window to say "The following updates were not installed:" followed by the
> single security update I have left.
>
> I discovered that I'm not the only person who has had this problem while I
> was discussing the issue in a forum dedicated to the firewall I have
> installed. I have tried uninstalling the firewall to see if that would work
> but to no avail.
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"Savastano Federico" wrote:
> hello everyone!
>
> I'm from Argentina, sorry for my english...
>
> I have an enormous problem :O...I have automatic updates turned on, and
> updates get downloaded...
>
> But when it tries to install, it doesn't!
>
> I've got original windows' product (Windows Professional Service Pack
> 2)...And I'm so angry because of it
!!
>
> As soon as you can help me with my problem I'd be so grateful!
>
> KIZZ!! 
>
> ^^Fede^^