How do I disable a viper alarm already installed on a car that i am buying but the car won't start?

Ok, I had the same problem with a Nissan Maxima! Here is what I did:

First, you need to cut all the wires from the alarm and splice them back where they came from. Its a difficult! Secondly, you have to find the fuel pump relay switch, which should be a blue box in the kick panel. Jump the relay switch so it by passes the relay. All the alarm actually does is cut off the power to the fuel pump. Or, if you take a hot wire and run it to the fuel pump the car will start. In the box under the dash should be a black box. It has a key inside of it with a mirror. You need to take that key and try starting the car.