Hi,
Please check a status of Secure Boot as follows:
1. Press the Win logo + R keys to open the Run dialog, type msinfo32, and press Enter.
2. In the right pane of System Summary in System Information, see what the Secure Boot State value is.
If it`s on, please disable Secure Boot using the manual: https://technet.microsoft.com/en-us/.../dn481258.aspx