Did you load the software first before plugging in the USB modem?
Or plug in the USB modem and than loaded the software?
Remove the USB modem and uninstall the software
Reboot the computer “Do Not Plug In The USB Modem” reinstall the software
Reboot the computer after the computer have finished rebooting plug in the USB modem
Windows will now find the USB modem hardware and install the driver
One must always read the user manual first, if not sure about how to install or use equipment