I saw that while keyboard input seemed, blocked, I was still able to communicate between PC and keyboard adjusting volume and opening calculator, for example. Moving forward, I tried uninstalling the devices multiple times and reinstalling them (after system restart), I tried modifying the registry, I tried running several different scans... ZERO luck. Then I thought, "Maybe disable Kaspersky?" Still nothing. I uninstalled, restarted, nothing. Windows troubleshoot was unable to fix my "driver error".