So you got the Windows 10 update of December 2017 and now your keyboard num lock, caps lock and scroll lock lights (LED) no longer work.
Check windows version as this fix worked for me on this version
open a command prompt by typing ‘cmd’ into the search bar then enter
you should see something like
IF your version is even close this should work fine.
Open Device Manager, and goto ‘Universal Serial Bus controllers’. Start removing ‘USB Root Hub’ devices until your keyboard stops working.
Give it a few seconds, then restart your computer.
All Done. Enjoy