Quick question: Wiping Vista off completely installing Windows 7

I'm going to be wiping Vista completely off and installing Windows 7 on my laptop that currently uses Norton Internet Security. I believe it is not an upgrade so I'm wondering how do I go by reinstalling Norton. I have the a 3 PC -1 user software but I'd like to keep the 1 that's still remains for my desktop. (the other is used by another laptop)

 

Thank you!