Depending on the type of modem that you are using, you might or not need an additional driver. Usually, these types of devices have on their internal memory all the required drivers. To use a device like yours, you only need to connect it to a computer and wait for the installation process to finish. Also, you should know that some Lava Modems work only on machines that have Intel CPU. This might be a reason why you can't use yours. For a better understanding of this problem, and to find a solution, I suggest that you contact the reseller from which you bought the device. He can provide for the support that you need.