Do you want to remove the blue highlighting, or change its color to pink?
On a more serious note, this could be Windows Narrator – reads selected text aloud (does it?) and highlight items in a blue box.
It gets enabled by pressing the Windows key and Enter. Try to hold CAPS and ESC (or CTRL + Windows Key + Enter) to disable it.
Or navigate to Start Menu\Programs\Accessibility\Narrator, then uncheck "Enable visual highlighting Narrator cursor". Good luck!
This post was edited by Qry on Oct 14 2018 08:50am