I have an aftermarket Ford remote start on my 2005 Ford Sport Trac. I tried to start with my truck with the key in the ignition, I would hear clicks and then the alarm would go off. I have tried to reset the alarm and the kill switch would not stop the alarm. My truck is disable due to the alarm.

First thing is to identify the alarm system, I.E.- who made it and what model it is? (like Viper, Automate, etc...)
Contact the aftermarket alarm manufacturer or the person that installed the alarm (if you had/know who installed the alarm system). Most major system have a phone number and a list of qualified installers for their systems. They will be able to direct you to a shop that can service the system. If your vehicle won't start, you may have to have it towed to the location to diagnose and correct the problem.