Windows 10 Desktop Start Menu Box

[DD716TED]

Every time I touch the mouse on the new Windows 10 computer, the "Start Menu" BLACK BOX appears in the lower left hand corner (quarter) of the screen.. None of my other computers do this.. Is there a way to prevent this annoying box from appearing every time the mouse is touched?/

[agesilaus]

Make sure you don't have a stuck windows key too.

[enblethen]

New computer needs to do all updates including optional ones.
Then do disc cleanup including system files.