Enable / Disable Driver Signature Enforcement in Windows 10/8.8.1/7

Enable / Disable Driver Signature Enforcement

Disabling Driver Signature Enforcement:
Go to Start > Search cmd and Right-Click on Command Prompt and select Run As Administrator.
Click Yes when prompted.
Type bcdedit -set TESTSIGNING ON and hit enter.
Restart your Computer

NOTE: You can also do this through F8 when booting your computer.

Enabling Driver Signature Enforcement

Go to Start > Search cmd and Right-Click on Command Prompt and select Run as Administrator.
Click Yes when prompted.
Type bcdedit -set TESTSIGNING OFF and hit enter.
Restart your computer.

Another method - Through Advanced Options

Open Start > Click on power button 

Press Shift+click on Restart

Then this menu appears

Click one Troubleshoot > Startup

Click on Restart

Click 7 or F7

Credit : http://jamesrayanderson.blogspot.com/

Images - google images