Somehow I accidentally disabled all USB ports through the “Device Manager.” So I've lost mouse and keyboard.
My motherboard is an ASUS Z170-A.
When I restart the machine I can get into BIOS where I have mouse and keyboard. At the BIOS level, all USB ports are enabled. But as soon as I continue into Windows, they become disabled again.
Edit: Since I do not have access to a PS/2 mouse or keyboard, I have decided to try to remote into the machine since it's on the same network. I have it's IP address. I shouldn't have to open any ports if I'm trying to RDP from within the same network, right?