truck won't start, think it has to do w/ anti theft light how to fix?

You could have an issue with the anti-theft system that corresponds with the key used to start the vehicle. You could also have an issue with the anti-theft system in general. A proper diagnosis will need to be performed to determine what is failing when the issue occurs. Click on the link to find a local repair facility near you that can help! http://repairpal.com/nissan-within-10-miles-of-live-oak-florida-32060