Do you know if it's a PCI card (Win)Modem or built into the motherboard? Have you checked in Device Manager (Start -> Control Panel -> System -> Hardware -> Device Manager) for PCI devices that are not recognised/configured properly (should be a little yellow exclamation mark icon attached)? Do you know the make, model and chipset of the modem? If not then you may need to open up the PC and collect as much detail as possible (including chipset manufacture - e.g. Conexant, Lucent, Ambient etc. - chipset identifiers printed on the chip(s), manufacturer name and FCC ID on the board etc.). When dealing with WinModems it's usually necessary to get these details and then go hunting from the most appropriate drivers (since it is the driver that does most of the work for a software modem). I have configured many WinModems in my time and each time it involved a lot of detective work and fluting around.