There is a Symbol that pops up whenever I try to.

There is a symbol that pops up whenever I try to start the car. It looks lije a car with a lock in front of it. The car won't start but it does try to start. I eead something that says it may be somethingwith the cars ssecurity system. I realkt need to know what that means. I just spent 6000.00 on it yesterday.