Did you follow all the advice on the Windows 8.1 of the Windows 8 sticky
If you are using Windows 8.1, do the following:
1. From the Metro Start Screen, open Settings (move your mouse to the bottom-right-corner of the screen and wait for the pop-out bar to appear, then click the Gear icon).
2. Click ‘Change PC Settings’.
3. Scroll down, and click ‘update and recovery’
4. Click ‘recovery’
5. Click under advanced start up and restart now
6. Click ‘Troubleshoot’
7. Click ‘Startup Settings’
8. Click Restart
9. When Win8 restarts type the number next to \"Disable driver signature enforcement\"
For Windows 8 drivers please download:
http://www.airnavsystems.com/download/anrb/drivers/ANRB-Win8Drivers-v2.08.30.zip Instructions:
1- Download the file above;
2- Unzip it to a folder on your computer;
3- Disconnect your RadarBox USB cable, wait a few seconds and connect it again;
4- When Windows prompts you to find the proper RadarBox driver browse the folder where you have extracted your drivers to;
If the above Windows prompt box does not appear:
1- Go to Windows Control Panel - Device Manager- USB Controllers - RadarBox - Driver - Update Driver
2- Point at the relevant folder and install the drivers;