Anyway, staying on topic,
Prime check your ports. Remember that the modem uses a COM port, and if the ports are disabled or aren't functioning the modem won't work either.
(Had to do this on my Dell Dimension XPS D333, printer wouldn't work thru the LPT port, Device Manager said The firmware is not allocated for this device in the LPT1 props, so I went into the system setup program and turning off "Plug and Play OS" fixed it)