Untrusted System File

This may occur 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 corruption or walk you through what needs to be done. 

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