I'm having a similar problem, stopping me from doing 5 updates.

I used the stand-alone installers and got all 5 installed.

My cousin just asked me to run the restore to factory settings utility from the hp dvd because in the last weeks the notebook has becamt so slow that can't be used anymore and, since he need it, he thinks that a restore won't be so worst for him... I will start to do this next days...
Many thanks for your help...

Hi Tom... don't worry...
Yes the hp restore was successfull... I've downloaded and installed the sp2 and all others updates.
I don't know what's happened... the notebook comes with vista sp1; maybe something happens some year ago, before the sp2 was released... a virus, a trojan or something else could have corrupted the registry and/or files and since this moment no update could take place. Now it's ok. Thanks for your patience...
Bye...
Fabrizio