Migrating to Vista 64 bit

Hi all. I have an HP Pavilion DV7 1130el with Windows Vista 32 bit (pre-installed) and I'm going to migrate to the 64 bit version of Vista... I use Norton Internet Security 2012 (v19.8.0.14) and my key is shared with one computer running Windows XP.

 

When I will install Vista x64 I'll have to format all the hard disk and install again Norton Internet Security 2012.

  1. Where can I download the x64 bit version?
  2. Where can I find my personal key?
  3. Will I be able to use it again for the new installation?

 

Thank you in advance... I hope in your help!

Michele