I need replace my PC

Hello I'm new here..I have a question i buy norton internet security for 3 pc's...few days agos i renewal, but now i have 2 pc's working and another one is in trash, but i planing buy one new pc.. how i can do installed to my new pc norton, because i have for 3 and now only 2 working..sorry my english not good/...

thanks u

i speak spanish if someone can help its better for me thanks u