I have been checking out posts on the Users Forum on the Packard Bell site, this problem seems to be pretty common, most of the post indicating that they have tried everything so far suggested, their forum is littered with posts from people with Packard Bell computers running XP not being able to get the Freeserve/Wanadoo Broadband working.
I also noticed on that forum that it is also a problem for people trying to install AOL Broadband on a Packard Bell + XP with the Speedtouch Modem.
It seems to be the Speedtouch software that is the problem, I have tried looking at the Speedtouch website to see if there is anything helpful on there, but that seems to be mainly devoted to sales, but I will investigate there again when I get a chance.
I am trying to avoid the tedious task of a clean install of windows, but it is looking more and more like the only option.
I have exchanged a couple of e-mails with the technical help desk, have sent them a maill with everything I have tried so far, what happened when etc., I am still waiting for a response (but, it was such a long e-mail he is probably still reading it)
I will let you know how I get on.