That isn't the USB flash driver. You will find the required driver in SETool2Lite_folder\drivers\usb_flash_driver\gg-setup.exe (version 1.08 and earlier) or in SETool2Litev_folder\drivers\usb_flash_driver\ggsemc.inf (version 1.10). In this case right click on ggsemc.inf and choose Install.
Now it should work...