Mr. Razgriz,
1. Remove the USB cables and UNINSTALL the Software.
2. REBOOT and reinstall the Software.
3. When it prompt's you to install the USB cables; you'll have to check and see if the port you are installing it into is USB 2.0, 1.1, or 1.0; I believe that is "likes" ONLY version 2.0 USB but, it will live with v1.1.
4. MAKE SURE THAT you recycle the power from the G940 device as well.
Good Luck!