Start Windows 8.1, and follow the below steps,

1. Press [Win]+[I], the setting panel will display
2. Click “Change PC settings”
3. Click " U pdate and Recovery

4. Go to " Recovery " and U nder Advanced starup click " Restart now "

5. Click “Troubleshoot”

6. Click “Advanced options”
7. Click “Startup Settings”
8. Click “Restart”
9. The PC will restart, and press functions key“F7” or numbers key “7” to choose “Disable driver 
signature enforcement”
10. Install the driver accordingly