Phantom Car

I drive a 2000 Ford Taurus with about 80,000 miles on it and there hasn't been any significant problems with it until tonight while I was driving home from work. I got to the street that I live on and the windows started rolling themselves down, then the "low coolant" light came on and I thought they were somehow related and that cars did that. I figured I'm almost home, I'll check it out. As I kept driving the "low coolant" light turned off and the emergency brake light came on, then the seatbelt light, low gas light, and airbag light and then all turned off. Then the locks started locking and re-locking themselves while the inside lights were turning on and off. By the time I got home and put the car in park and turned it off the alert sound my car makes to remind me if my lights are on or my keys are still in the ignition would not stop unless we disconnected the battery. In addition to this, my windows can no longer go up or down. This all happened in about a 2 minute time span. What could the problem be? Would it be expensive to fix?