Could I ask what type of keyboard this is? Wired, WiFi, or Bluetooth?
It's a laptop - built-in keyboard.
Along with checking the keyboard, have you tried reinstalling the drivers?
Just tried that at your suggestion. What I did was uninstall the keyboards in Device Manager - then Searched for Hardware Changes. However, I could not uninstall what I guess is the default keyboard. Without it, how could I log in when I reboot? Also, I did not restart the laptop before checking for new hardware. the message said that to complete the uninstall, I should reboot. Is this a problem?
Does turning off Num Lock do anything?
Don't know - but I'll try it after I try the other suggestions you've given me (one thing at a time).
Do you have any other input devices that might be interfering?