Hi
Things are ok now.
The modem was connected to the USB because it used a converter cable (serial to USB).
With the reinstalled XP in the new hard disk I couldn't configure the modem.
It works now and this is what I did:
Replace the serial-to-USB cable with a serial-serial cable.
Connect the modem to a serial port.
Win XP configures the 'new' hardware by itself, not using Supra's driver, but the driver XP finds most 'compatible'(???).
It works.
Then I replaced the serial-serial cable with the serial-to-USB cable and connected the modem to a free USB.
It works in the new position.
Interesting thing is that it works!
Thanks all.