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
Click Yes when prompted.
Type bcdedit -set TESTSIGNING OFF and hit enter.
Restart your computer.
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
Click on Restart
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