FastAccess ADSL Windows Driver is typically a software package or driver used to enable the proper functioning of an ADSL (Asymmetric Digital Subscriber Line) modem or gateway device on a Windows computer. ADSL is a type of broadband internet connection that uses existing telephone lines to transmit data. The FastAccess name may refer to a specific brand or model of ADSL modem/router, often bundled with drivers to ensure smooth communication between the device and your Windows operating system.