A little while ago I was driving through a drive through line in my 1997 mercedes benz s320. I had to stop and go multiple times as the line was quite long. When I got to the window, my car suddenly began to make a loud sputtering noise similar to a weed eater or lawnmower. I was disturbed, but figured If I just got the car home I would be ok. I got onto the highway and suddenly the noise stopped. However, when the noise stopped, my steering system locked up and it became very difficult, almost impossible, to steer the car. I got off the highway and could barley make the turn to get off the offramp. As I was driving down the street towards my house, smoke began billowing out of the front drivers side along with a burning smell. I stopped the car near my apt and shut it off, then managed to push it into a nearby lot. I have not started it up since.
I know little to nothing about cars. My questions are
What might be/is probably wrong with it?
How much would it probably cost to fix?
Is it even worth it or is this car dead?