Modems list unavailable

Hi all.

A strange behavior. I've seen some people having the same problem, but
no solution.

Some time ago, I bought a bluetooth mobile phone (Sony T630) and then
configured my system with the bluetooth connectivity. Despite the fact
that the synchronization software with outlook is a crap, everything
went fine and I was able to comunicate with my mobile to exchange
pictures and others. It was also recognized as a bluetooth modem
through a virtual com port and I'm able to access it.

A bit later, I also tried to install a old Fax-modem to use the fax
function. I then connected my old Zyxel to com1, and tried through
Hyperterminal: result ok. But when I tried to discover it with the
wizard of the control panel (Phone and modem options, [Modems],
[Add]), no modem was found: the system is only looking for Bluetooth
devices. Even stranger, if I check the "Don't detect my modem...", I
only obtain a list of modems from Ericsson and Sony Ericsson.

I then presume that my configuration was overwritten while I first
installed my bluetooth modem. Does someone have a solution which does
not imply a complete reinstallation ?

Any help would be appreciated, even any clue that you would have.

Thanks and regards,

Luc