Several possible complicating factors: Keyboard is HP model KU-0841 and the Num Lock is illuminated orange and does not respond when I try to turn it off. I upgraded from Win 7 Home Premium that shipped with system to Win 10 using Microsoft website. I have made a boot usb from Windows...
Twolf Keyboard: 51xx, 5335U, KB-06xx, KB-09xx, KBPH-0806, KM713A, KG-0851, KU-0841, SK806A, SK29xx, I101-P01, PR11-01, PR1101U, RK713A, 9131URF, 5189URF, KBRF1921 Mouse: KM713A, RM713A, M389, M889, MG-0856, MOAFUO, MOBJKC, MOBJKO, MOBLUL, MODGUO, M-SBQ133, ...