Conexant doesn't make SupraMax modems, Diamond MM does. Conexant is a chipset maker. Perhaps you meant instead: "I need a Windows Vista driver for a Diamond MM modem (model # xxxxx) that contains a Conexant xxxxx chipset". Either way you must provide a SupraMax model number and/or the Conexant chipset number. Preferably both.....
And if this device came pre-installed in your computer at the time of purchase, you must also include the computer brand and model that it came installed in.
Or is it a retail add-on product?