It's very likely that the driver hasn't been installed properly or that you don't have the right one for your version of Windows. Try uninstalling the driver, restarting your PC, then reinstalling it (making sure that it's the right one for your Windows) and rebooting again.
Additionally, you can try uninstalling and reinstalling the application as some freak accident may have caused it to not install or register properly.
Lastly, try using a different USB port, preferably one that you've tested with a different device and that you know for sure is working.