Hello Joao,
See if the solution in this thread helps.
http://www.microsoft.com/communities...8-f878e351887f
See if anything here helps.
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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