problem with starting my t reg ford focus?

hi,The person i bought my t reg ford focus off had a new cut,because he couldn,t open the door with the ignition key any more. I have had the car for 5mths,the key used for starting the car had worn away and wouldn,t start the car anymore,my husband took the chip out of old worn key,put in the new key we went on line got show how to reprogramme key. My car started approx 6 times after programming it. The car would start at all on the key anymore,the imobliser does stop flashing,the only way the car will start is by me bump starting it. Please can you help me because fed up of pushing the car to start it?