A 74-year-old woman lost control of her car and careened through a crowded Greenwich Village park, killing four people and injuring 24, authorities said. The car crashed down a walkway, sending bodies flying and crushing benches, wrought-iron fences and a concrete drinking fountain. Witness Roy Bank, 19, said the woman was traveling toward Washington Square Park on a street that ends there. Instead of turning, she hit the curb with a bang and drove right on through, Bank said. Police said the driver, Stella G. Maychick, told them that the car started to race when she touched the gas pedal. New York University officials said the school, whose buildings surround the park, had organized a cleanup day in the park and many students and school volunteers were there at the time.