Bryan is 100% correct, you have a old Build, that's actually build 1803, which is close to a year out of date.
If you open Winver Via the search it should show, prob 1803 ( highlighted in the picture).I've manually upgraded to the latest:
What more than likely has happened in when 1809 came out ( the current public build) it was pulled /stopped because of a bug, when MS re -released it again, a HUGE number of computers didn't upgrade.
Having the second drive as D is not a good idea.
Cant explain the technical details right now ( SWMBO) is calling.
BUT as a quick experiment, go into drive manager, re assign a different Drive letter to the current D, F,H I -- what ever anything but D.
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