That fixed it!

I updated Windows and the errors are now gone. I had "automatic updates" disabled because it's a server and I don't want it updating and restarting on its own. It appears that I haven't updated in a while. Lesson learned.

Thanks very much for the help. Excellent customer support ...

I am trying to run a server using the newest Alpha build: 0.17.4. I am unable to run it properly due to the following repeated error:

1.045 Error FileUtil.cpp:401: Couldn't remove C:\Factorio_0.17.4\temp\currently-playing\level-init.dat: Incorrect function.

This error is repeated for many file ...