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Presumably the modem is internal to your computer? If so have a look in control panel (calssic view) > system select hardware and Device manager. Delete every entry for the modem and any network cards, toghether with any question marked or crossed out devices. Then restart the PC and see if it can detect correctly.
If the modem is external, then I'd do the same, but just delete any network drivers. Make sure that when you reboot the PC you also reboot the modem.