Try this
Access Startup Settings
When the Choose an option screen appears, click or tap the Troubleshoot tile.
Next, click or tap the Advanced options tile.
Select the Startup Settings tile on the Advanced options screen.
Click the Restart button on the Startup Settings screen to reboot your computer again.
Disable Driver Signature Enforcement
On the Startup Settings screen, tap the F7 or 7 key on your keyboard to select the "Disable driver signature enforcement" option.
Windows 8 will immediately boot to its typical lock screen. Sign into Windows 8 as you normally would - everything will look the same, except Windows will no longer demand driver signatures until you next reboot.
You can now install unsigned drivers as you would on previous versions of Windows. Windows will alert you if you try to install a driver that isn't properly signed, but you'll see an "install this driver software anyway" option you can choose.
Reboot
When you're done installing the unsigned drivers, reboot your computer. Windows will keep using any unsigned drivers you've already loaded, even as it enforces signature requirements for new drivers.
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