Product Activation

Hi

 

I have norton anti virus installed on my laptop.  it has over 300 days remaining.   However, I would like to install it on a new pc that I have.   It says I can install on up to 3 machines but I do not have the product key anymore, and the email address I registered with no longer exists as I have changed ISP.

 

Does anyone have ay ideas on how I can obtain my product key to use on the second PC?

 

Many Thanks