A PS/2 keyboard and mouse should work on the login screen and you should be able to sign in to your system. After doing that, you can reinstall your USB Hub and USB keyboard and mouse drivers.

It will allow you to connect either a PS/2 keyboard or a USB keyboard in fallback mode to the Expert using an ATMega328P and a bespoke DIN-13 to DB-13 cable. As it turns out, there’s a wealth of ...