microsoft "Your device needs the latest security updates"
This Windows10-looking update had tried several times and I have to reboot several times, but it seems to be unsuccessful. Is this even a legitimate Windows 10 update? Don't you usually ask permission?
Also check at Settings>System>About if you have Fall Creators Version 1709 and if not what I would do is manually install Fall Creator Version 1709 by installing Media Creation Tool and choosing to Upgrade Now.
This the most stable method to upgrade to the new version (which you need anyway) and will bring you fully up to date with reinstalled Windows that often will solve any other problems you have.
You can use the same tool to download the ISO or create bootable media so you only need to do it once, and have the bootable media for repairs or possible Clean Install.
But remember that a factory or Upgrade install are inferior installs that most enthusiasts would never run in the first place because they'd expect endless issues. Most prefer to do the gold standard Clean install from this link which has had no reported issues:
I hope this helps. Feel free to ask back any questions and let us know how it goes. I'll keep working with you until this is resolved.
---------------------------------- I am a volunteer and not Microsoft.
Approaching 100,000 helped in forums. I don't quit for those who are polite and cooperative.