A USB Data Fax Voice Modem driver allows a USB modem to work with your Windows computer, enabling data transmission, faxing, and voice communication. To install it, first connect the USB modem to your computer. Windows should automatically detect it, but if not, download the appropriate driver from the modem manufacturer's website. After downloading, run the installer and follow the on-screen instructions to complete the installation. Do you need help finding the driver for a specific modem model?