Solve Win8.1 security startup is not properly configured

  

First, go to the start screen and type gpedit.msc to start the computer management screen (make sure you have administrator privileges).
Click on the "Computer Configuration" section of the "Administrative Templates" and double-click on the "All Settings" option on the right.
Scroll down to find "Use Enhanced Boot Configuration Data Verification File" and double-click, select the "Enable" option, click “Apply” and restart the computer.
If your BIOS menu has a secure boot option, make sure it's turned on, and that's it.

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