Keyboard and/or Barcode Scanner Not Working

4-day marathon of tracking down a major problem shared by 5 different clients.
USB input devices, keyboard and scanner, will not output data that has been input. In other words, keyboard and barcode scanner won’t work. Think that won’t put a hitch in your giddy-up?
Turned out to be, get this, HitmanProAlert.
Go figure. I love my job. It’s so easy. I just finished remotely controlling about 12 computers and implementing the fix. Uninstalling HitmanProAlert.

So, yeah, I think I got everyone squared away today. If anyone out there is still having this problem, lemme know.