Some win7 systems may not recognize the hardware, driver installation tutorial:
Right-click Computer - Device Manager - Right-click the secondary screen of the yellow question mark - Update Driver - Browse the computer to find the driver - Browse to the driver located in the software directory - Install it

If the secondary screen is not a yellow question mark device, it has been installed as a com serial port device by mistake, please right-click to uninstall it, check the delete driver, and then follow the above steps to install.