Keyless Entry Security System problem

My vehicle has a key-less entry system. Today I decided to check my oil and tire pressure. When I was done checking the oil, I shut the hood and got into the car to start it but nothing happened at first. Then the alarm starting going off along with a weird clicking noise. I turned the alarm off but the clicking noise continues. I read through the key-less entry security manual and tried just about everything I could, but the car still will not start and the clicking noise continues. Please Help!