Keyboard doesn’t work at Login

I just start up my computer [window xp home ed.] one morning just like usually, but when I try to login I couldn’t type in my password. I tried pressing numlock, capslock, and scroll lock but the light doesn’t change. Enter doesn’t work, space doesn’t work no keys work.
All I see is the regular num lock light on.
I tried different jacks and multiple keyboards while restarting it each time but still doesn’t work.
Mice works fine…help anyone?

I’m currently using someone elses computer.