I have come up with an alternative method to install the Arduino drivers on Windows 8.
This method does not require new driver files or installation of a test signature.
- Windows Key + R
- Enter shutdown.exe /r /o /f /t 00
- Click the "OK" button
- System will restart to a "Choose an option" screen
- Select "Troubleshoot" from "Choose an option" screen
- Select "Advanced options" from "Troubleshoot" screen
- Select "Windows Startup Settings" from "Advanced options" screen
- Click "Restart" button
- System will restart to "Advanced Boot Options" screen
- Select "Disable Driver Signature Enforcement"
- Once the system starts, install the Arduino drivers as you would on Windows 7