C Hing pls check whether the below message can help :
Please check if you have performed these steps to disable the driver signature enforcement in Windows 10 Technical Preview.
a. Press the Win + C and click on PC settings.
b. Switch over to the “Update & recovery” section.
c. Then click on the Recovery option on the left hand side.
d. Once selected, you will see an advanced startup section appear on the right hand side. You will need to click on the “Restart now” button.
e. Once your Computer has rebooted you will need to choose the Troubleshoot option.
f. Then head into Advanced options.
g. Then Startup Settings.
h. Since we are modifying boot time configuration settings, you will need to restart your computer one last time.
I. Here you will be given a list of startup settings that you can change. The one we are looking for is “Disable driver signature enforcement”. To choose the setting, you will need to press the F7 key.