Hello Maurizio,
I too have this same issue. I have followed through with the little amount of help I recieved. I have yet to resolve, and have searched the KB and form for any information. None of it has been helpful. I downloaded the MSXML Service Pack, and that did not help. I have uninstalled, cleaned the registry, deleted the account and set back up, but still nothing has worked. I have received any further instructions or ideas from Symantec.
Hope you have better luck than I with this issue...
MK