Disable driver signature enforcement in Windows 8.0 and 8.1

 
  1. Open the Windows 8 Charms bar.
  2. Click Settings > Change PC settings.
  3. From the PC Settings window, select General on the left panel.
  4. On the right panel, locate Advanced startup and select Restart now.
  5. From the Choose an option menu, select Troubleshoot.
  6. From the Troubleshoot menu, select Advanced options.
  7. From the Advanced options menu, select Startup Settings.
  8. Click Restart and select Disable driver signature enforcement.