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>

<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