Power steering down?

Hello! I drove my car (Mitsubishi Galant GLI 2,5l Bj. 98) today, made funny noises until so slowly the steering made difficult until hardly anything left. Did the car still drive to the parking lot where it is still standing. It looks as if there is such a small wedge ring or similar slipping away. Can someone give me an information? Can I still drive short distances with the car? Would be nice if someone had some advice, I am dependent on this car and need it theoretically again tomorrow. Greetings Siega