When trying to install a driver for your eMotimo TB3 or Dynamic Perception MX3 on Windows 8, you may receive the error message “The driver is not digitally signed”.
If this happens, you need to modify your Windows 8 settings to "Disable Driver Signature Enforcement".
To do that, follow these steps from "http://mytechblog.com/2013/03/install-arduino-drivers-on-windows-8/"...
Step 1 - Open the Windows 8 "charms bar" and click Change PC Settings. Then go to General and under Advanced Startup and click Restart Now. This will obviously restart your computer so make sure you have saved any work.
Step 2 - System will restart to a "Choose an option" screen. Select "Troubleshoot" from the "Choose an option screen"
Step 3 - Select "Advanced options" from the "Troubleshoot" screen
Step 4 - Select "Startup settings" from the "Advanced options" screen and then click "Restart"
Step 5 - System will restart to "Advanced Boot Options" screen. Press the "7" key to select "Disable Driver Signature Enforcement"
Once the system starts, you should be able to install the Arduino driver. When you see the warning screen, click "install this driver software anyway"