My Vista Ultimate and a noyous Ras Client Error 633

Hi,

I have a problem with my Ras Client:

when I try to use a Ras connection (with a remote connection made for
the internal modem, or with a UMTS express card and its software, or
with a nokia phone connected by Nokia Pc Suite and BT) it always gives
me back a ras client 633 error.


A sample of the error (in Italian language) is:

Nome registro: Application
Origine: RasClient
Data: 22/08/2007 18.02.02
ID evento: 20227
Categoria attività:Nessuno
Livello: Errore
Parole chiave: Classico
Utente: N/D
Computer: Apus-Damiano2.sede.server1.apus.it
Descrizione:
CoID={9D79B15F-EBA3-47B2-9056-C70D1E53B8A3}: la connessione denominata
Tiscali PSTN composta dall'utente APUS\danderli non è riuscita. Codice
di errore restituito: 633.
XML evento:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="RasClient" />
<EventID Qualifiers="0">20227</EventID>
<Level>2</Level>
<Task>0</Task>
<Keywords>0x80000000000000</Keywords>
<TimeCreated SystemTime="2007-08-22T16:02:02.000Z" />
<EventRecordID>7246</EventRecordID>
<Channel>Application</Channel>
<Computer>Apus-Damiano2.sede.server1.apus.it</Computer>
<Security />
</System>
<EventData>
<Data>{9D79B15F-EBA3-47B2-9056-C70D1E53B8A3}</Data>
<Data>APUS\danderli</Data>
<Data>Tiscali PSTN</Data>
<Data>633</Data>
</EventData>
</Event>

I've tried to reinstall the modem, to update the drivers, to reinstall
sw, to search a solution in internet, but I do not succeed to resolve
the problem.

The supplier of my laptop (Dell) suggest me to reinstall Vista, but it
does not go me to lose various days to reinstall all the software.

Can anyone help me to solve my problem?

Thanks