1996 Ford Taurus

My 1996 ford tauras, four door, lots of miles, and when im driving a small clicking noise occurs and then my power stearing and radio goes off, windows stop, and the seat belt sign comes on, its seems like with a sudden jerk it flickers off and on, but as soon as I put it in park the car is fine again and everyhting works. Whats going on?
August 16, 2007.

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