The NEC USB Windows driver refers to the software necessary for Windows to interact with a NEC USB host controller. NEC (now often associated with Renesas) manufactures USB controllers that are used in many motherboards, laptops, and external devices to manage USB connectivity. These drivers allow the operating system to detect and manage devices connected to the USB ports (e.g., USB flash drives, external hard drives, keyboards, and mice).

If your computer has an NEC USB controller (often referred to as Renesas USB 3.0 controller, as Renesas acquired the NEC USB business), the NEC USB driver ensures that your USB ports function correctly, especially for higher-speed USB devices like USB 3.0 or USB 3.1.