A USB composite device is a single device that provides multiple functions, such as a combined keyboard and mouse device. These devices require a driver in order to work with Windows. A driver is already available within Windows, so oftentimes you can plug in the device to the USB port and install the Windows driver. However, some devices do not work with the Windows driver. In these cases, it is best to install the driver that is included with the device to act in place of the USB composite driver. Writer Bio
