Untrusted System File

This can sometimes happen if some of your system files have become corrupted. 

Firstly, ensure that your copy of Windows is genuine and up-to-date. If you are using a Windows Insider or Preview build, you will need to consider rolling back to a public build. 

If the issue persists, try checking your system for any errors by opening a CMD window with administrative permissions. You’ll then need to type the following: 

sfc/scannow  

Let this run without interference, though it may take a while. It will also try to repair any corruptions, or walk you through what needs to be done. 

Unfortunately, if this still doesn’t work, you may need to reinstall Windows.