I'm not sure what happened, but my keyboard keys stopped working. I can't move my character or engage with anything in the game. Has anyone experienced this?

Update: I just checked and it appears that my WASD keys and anything related to moving my character are not working. I'm standing next to my horse, can't use 'x' to mount, can user 'c' to crouch, but I can open my invertory and map, and change my weapons. I try fast travelling thinking that my character was clipping my horse, but I could move after fast travelling either.